Note 9 Nov 2024 PDF

For **Biotite Gneiss**, here’s the classification based on the categories: - **Rock Texture**: Foliated (gneissic layering/banding) - **Grain Size**: Medium to coarse - **Mineral Composition**: Biotite, quartz, feldspars (both alkali and plagioclase), possibly garnet or other accessory minerals - **...

For **Biotite Gneiss**, here’s the classification based on the categories: - **Rock Texture**: Foliated (gneissic layering/banding) - **Grain Size**: Medium to coarse - **Mineral Composition**: Biotite, quartz, feldspars (both alkali and plagioclase), possibly garnet or other accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: High - **Protolith (Parent Rock)**: Granite or other felsic to intermediate igneous rocks For **Auden Gneiss**, here’s the classification based on the categories: - **Rock Texture**: Foliated (gneissic layering/banding) - **Grain Size**: Medium to coarse - **Mineral Composition**: Typically quartz, feldspars (both alkali and plagioclase), biotite, and possibly garnet or amphibole depending on specific composition - **Metamorphic Origin**: Regional - **Metamorphic Grade**: High - **Protolith (Parent Rock)**: Likely granite or other felsic to intermediate igneous rocks For **Hornblende Gneiss**, here’s the classification based on the categories: - **Rock Texture**: Foliated (gneissic layering/banding) - **Grain Size**: Medium to coarse - **Mineral Composition**: Hornblende, quartz, feldspars (both alkali and plagioclase), and possibly biotite or other accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: High - **Protolith (Parent Rock)**: Basalt, andesite, or other mafic to intermediate igneous rocks For **Granite Gneiss**, here’s the classification based on the categories: - **Rock Texture**: Foliated (gneissic layering/banding) - **Grain Size**: Medium to coarse - **Mineral Composition**: Quartz, alkali feldspars (orthoclase, microcline), plagioclase feldspar, biotite, and possibly muscovite or accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: High - **Protolith (Parent Rock)**: Granite For **Mica Schist**, here’s the classification based on the categories: - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Medium - **Mineral Composition**: Mica (both muscovite and/or biotite), quartz, and possibly garnet or other accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Mudstone (shale) or siltstone For **Biotite Schist**, here’s the classification based on the categories: - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Medium - **Mineral Composition**: Biotite, quartz, feldspar, and possibly garnet or other accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Mudstone (shale) or siltstone For **Muscovite Schist**, here’s the classification based on the categories: - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Medium - **Mineral Composition**: Muscovite, quartz, feldspar, and possibly garnet or other accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Mudstone (shale) or siltstone For **Crumpled Mica Schist**, here’s the classification based on the categories: - **Rock Texture**: Foliated (schistosity with crumpled or wrinkled appearance due to deformation) - **Grain Size**: Medium - **Mineral Composition**: Mica (muscovite and/or biotite), quartz, feldspar, and possibly garnet or other accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Mudstone (shale) or siltstone For **Chlorite Mica Schist**, here’s the classification based on the categories: - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Medium - **Mineral Composition**: Chlorite, muscovite, biotite, quartz, and possibly garnet or other accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Low to intermediate - **Protolith (Parent Rock)**: Mudstone (shale) or siltstone For **Glaucophane Schist**, here’s the classification based on the categories: - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Medium - **Mineral Composition**: Glaucophane (a blue amphibole), quartz, possibly plagioclase, garnet, and other accessory minerals - **Metamorphic Origin**: Regional (often associated with high-pressure, low-temperature metamorphism) - **Metamorphic Grade**: High (due to the presence of glaucophane, indicative of specific metamorphic conditions) - **Protolith (Parent Rock)**: Typically basalt or other mafic volcanic rocks For **Hornblende Schist**, here’s the classification based on the categories: - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Medium to coarse - **Mineral Composition**: Hornblende (amphibole), quartz, plagioclase feldspar, and possibly biotite or garnet - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Typically basalt or andesite For **Garnet Mica Schist**, here’s the classification based on the categories: - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Medium - **Mineral Composition**: Garnet, mica (muscovite and/or biotite), quartz, and possibly feldspar or other accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Mudstone (shale) or siltstone For **Serpentine Talc Schist**, here’s the classification based on the categories: - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Fine to medium - **Mineral Composition**: Serpentine, talc, possibly chlorite, pyroxene, and other accessory minerals - **Metamorphic Origin**: Regional (often associated with ultramafic rocks and their alteration) - **Metamorphic Grade**: Low to intermediate - **Protolith (Parent Rock)**: Ultramafic rocks such as peridotite or dunite For **Albite Schist**, here’s the classification based on the categories: - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Medium - **Mineral Composition**: Albite (a plagioclase feldspar), quartz, mica (muscovite and/or biotite), and possibly garnet or other accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Mudstone (shale), siltstone, or a felsic igneous rock like granite For **Talc Tremolite Schist**, here’s the classification based on the categories: - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Fine to medium - **Mineral Composition**: Talc, tremolite (a variety of amphibole), possibly chlorite, quartz, and other accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Low to intermediate - **Protolith (Parent Rock)**: Ultramafic rocks such as peridotite or serpentinite, and possibly other metamorphosed igneous rocks **6.20 Slate (gray)** - **Rock Texture**: Foliated (slaty cleavage) - **Grain Size**: Very fine - **Mineral Composition**: Quartz, mica (primarily muscovite), possibly chlorite - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Low - **Protolith (Parent Rock)**: Mudstone (shale) **6.18 Phyllite** - **Rock Texture**: Foliated (between slaty cleavage and schistosity) - **Grain Size**: Fine - **Mineral Composition**: Quartz, mica (muscovite and/or biotite), possibly chlorite - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Low to intermediate - **Protolith (Parent Rock)**: Mudstone (shale) or siltstone **6.19 Slate (red)** - **Rock Texture**: Foliated (slaty cleavage) - **Grain Size**: Very fine - **Mineral Composition**: Quartz, mica (primarily muscovite), hematite (likely contributing to red color) - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Low - **Protolith (Parent Rock)**: Mudstone (shale) **6.22 Mylonite (lineated)** - **Rock Texture**: Non-foliated (lineation from intense shearing) - **Grain Size**: Very fine to fine - **Mineral Composition**: Quartz, feldspar, mica, possible alteration minerals from deformation - **Metamorphic Origin**: Dynamic - **Metamorphic Grade**: Variable (depends on specific deformation conditions) - **Protolith (Parent Rock)**: Variable (could be granite, basalt, or other rocks in fault zones) **6.21 Foliated Amphibolite** - **Rock Texture**: Foliated (schistosity or banding) - **Grain Size**: Medium to coarse - **Mineral Composition**: Amphibole (hornblende), plagioclase, possible garnet or biotite - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Basalt or other mafic igneous rocks **6.17 Staurolite Schist** - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Medium - **Mineral Composition**: Staurolite, mica (muscovite and/or biotite), quartz, garnet, possible chlorite - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Mudstone (shale) or siltstone **6.16 Graphite Schist**, here’s the classification: - **Rock Texture**: Foliated (schistosity) - **Grain Size**: Medium - **Mineral Composition**: Graphite, mica (muscovite and/or biotite), quartz, and possibly feldspar or other accessory minerals - **Metamorphic Origin**: Regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Carbon-rich mudstone (shale) or siltstone **7.1 Pink Marble** - **Rock Texture**: Non-foliated (granoblastic) - **Grain Size**: Medium to coarse - **Mineral Composition**: Calcite, possible accessory minerals (such as hematite contributing to the pink color) - **Metamorphic Origin**: Contact or regional - **Metamorphic Grade**: Low to intermediate - **Protolith (Parent Rock)**: Limestone **7.2 White Marble (Limestone)** - **Rock Texture**: Non-foliated (granoblastic) - **Grain Size**: Medium to coarse - **Mineral Composition**: Calcite - **Metamorphic Origin**: Contact or regional - **Metamorphic Grade**: Low to intermediate - **Protolith (Parent Rock)**: Limestone **7.3 White Marble (Dolostone)** - **Rock Texture**: Non-foliated (granoblastic) - **Grain Size**: Medium to coarse - **Mineral Composition**: Dolomite - **Metamorphic Origin**: Contact or regional - **Metamorphic Grade**: Low to intermediate - **Protolith (Parent Rock)**: Dolostone **7.4 Serpentine Marble** - **Rock Texture**: Non-foliated (granoblastic) - **Grain Size**: Medium to coarse - **Mineral Composition**: Serpentine minerals, calcite, or dolomite - **Metamorphic Origin**: Regional (low-grade metamorphism of ultramafic rocks with carbonate influence) - **Metamorphic Grade**: Low - **Protolith (Parent Rock)**: Limestone or ultramafic rock with carbonate **7.5 Pink Quartzite** - **Rock Texture**: Non-foliated (granoblastic) - **Grain Size**: Medium to coarse - **Mineral Composition**: Quartz, with possible accessory minerals like hematite (giving the pink color) - **Metamorphic Origin**: Contact or regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Sandstone (specifically quartz-rich) **7.6 Green Quartzite** - **Rock Texture**: Non-foliated (granoblastic) - **Grain Size**: Medium to coarse - **Mineral Composition**: Quartz, possible chlorite or epidote (contributing to green color) - **Metamorphic Origin**: Contact or regional - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Sandstone **7.7 Hornfels** - **Rock Texture**: Non-foliated (massive, granoblastic) - **Grain Size**: Fine to medium - **Mineral Composition**: Variable; often includes quartz, feldspar, mica, and other minerals depending on protolith - **Metamorphic Origin**: Contact - **Metamorphic Grade**: Low to intermediate (from heat without high pressure) - **Protolith (Parent Rock)**: Shale, mudstone, or other sedimentary rock **7.8 Non-Foliated Amphibolite** - **Rock Texture**: Non-foliated (massive or granoblastic) - **Grain Size**: Medium to coarse - **Mineral Composition**: Amphibole (hornblende) and plagioclase, possibly garnet or pyroxene - **Metamorphic Origin**: Regional or contact - **Metamorphic Grade**: Intermediate to high - **Protolith (Parent Rock)**: Basalt or other mafic igneous rocks **7.9 Eclogite** - **Rock Texture**: Non-foliated (granoblastic, though may display lineation) - **Grain Size**: Medium to coarse - **Mineral Composition**: Pyroxene (omphacite) and garnet, possible accessory minerals like quartz or kyanite - **Metamorphic Origin**: Regional (high-pressure, low-temperature conditions) - **Metamorphic Grade**: High (ultrahigh-pressure) - **Protolith (Parent Rock)**: Basalt or other mafic rocks **7.10 Anthracite** - **Rock Texture**: Non-foliated (massive) - **Grain Size**: Very fine - **Mineral Composition**: Carbon-rich (high percentage of carbon with minimal impurities) - **Metamorphic Origin**: Burial or regional - **Metamorphic Grade**: Low to intermediate (metamorphosed coal) - **Protolith (Parent Rock)**: Bituminous coal **7.11 Serpentinite** - **Rock Texture**: Non-foliated (massive or sometimes foliated due to deformation) - **Grain Size**: Fine to medium - **Mineral Composition**: Serpentine minerals (antigorite, chrysotile), possibly magnetite - **Metamorphic Origin**: Regional (low-grade metamorphism of ultramafic rocks) - **Metamorphic Grade**: Low - **Protolith (Parent Rock)**: Ultramafic rocks, such as peridotite or dunite For 6.22 Mylonite (lineated), here’s the classification: Rock Texture: Non-foliated (lineation due to intense shearing and deformation) Grain Size: Very fine to fine (from grain size reduction during deformation) Mineral Composition: Quartz, feldspar, mica, and potentially other minerals depending on the protolith; may include alteration minerals Metamorphic Origin: Dynamic (typically associated with fault zones) Metamorphic Grade: Variable (low to high, depending on depth and temperature during deformation) Protolith (Parent Rock): Variable (could be granite, basalt, sandstone, or other rocks that experienced shearing)