18 Questions
What physical property of minerals is determined by marking unglazed porcelain or scratching with a knife and observing the powder color?
Streak
Which mineral group is known for its platy structure and perfect cleavage, often used in electrical insulation and heat resistance?
Mica group
What element is NOT commonly found in minerals according to the text?
Copper
Which physical property of minerals refers to the description of how much a mineral reflects light?
Lustre
Which of the following minerals might exhibit iridescence, showing rainbow colors either in the interior or on the surface?
Quartz
In terms of physical properties, which mineral group is more likely to have a shiny, metallic lustre?
Augite
What is the crystal system of quartz?
Hexagonal
What is the chemical formula of Plagioclase?
NaAlSi3O8
What is the cleavage of quartz?
Indistinct
Which mineral family does quartz belong to?
Feldspar family
What is the color of pure quartz?
Colorless
What is the physical property of quartz related to hardness?
7
In which type of rocks is quartz mostly found?
Igneous and metamorphic rocks
What is the crystal system of pyroxene Augite?
Monoclinic
Which mineral has a color range from dark green to brown and a hexagonal habit?
Hornblende
What is the specific gravity range of Orthoclase?
2.6 - 2.8
Which mineral has a good (prismatic) cleavage and a color that is greyish green and black?
Pyroxene Augite
What is the chemical composition of the Mica Biotite group?
(K (Mg, Fe)3(Al Si3) O10(F, OH)2
Test your knowledge of feldspar properties and its role as a flux in ceramics. Learn about the physical properties of plagioclase and orthoclase feldspar crystals, including color, hardness, and transparency.
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