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Questions and Answers
What is a thin section in optical mineralogy and petrography?
What is a thin section in optical mineralogy and petrography?
- A thin slice of a rock or mineral sample prepared for microscopic analysis (correct)
- A thin layer of mineral powder used for optical analysis
- A large piece of rock used for electron microscopy
- A transparent glass slide for mounting minerals
What is the typical thickness of a thin section?
What is the typical thickness of a thin section?
- 30 μm (correct)
- 1 mm
- 100 μm
- 10 μm
What is used as the thickness gauge for thin sections?
What is used as the thickness gauge for thin sections?
- Quartz (correct)
- Diamond
- Calcite
- Feldspar
What alters the color and intensity of light when a thin section is placed between two polarizing filters?
What alters the color and intensity of light when a thin section is placed between two polarizing filters?
What is the purpose of preparing thin sections in petrology?
What is the purpose of preparing thin sections in petrology?
What is the typical thickness of a thin section in optical mineralogy and petrography?
What is the typical thickness of a thin section in optical mineralogy and petrography?
What is the purpose of using quartz in thin section preparation?
What is the purpose of using quartz in thin section preparation?
What alters the color and intensity of light when a thin section is placed between two polarizing filters?
What alters the color and intensity of light when a thin section is placed between two polarizing filters?
What is the main purpose of preparing thin sections in petrology?
What is the main purpose of preparing thin sections in petrology?
What is the role of a photomicrograph in optical mineralogy and petrography?
What is the role of a photomicrograph in optical mineralogy and petrography?
Flashcards
What is a thin section?
What is a thin section?
A thin slice of rock or mineral for microscopic analysis.
Typical thin section thickness?
Typical thin section thickness?
Typically 30 μm.
Thickness gauge for thin sections?
Thickness gauge for thin sections?
Quartz.
What alters light in thin sections?
What alters light in thin sections?
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Purpose of thin sections?
Purpose of thin sections?
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Role of a photomicrograph?
Role of a photomicrograph?
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Study Notes
Thin Sections in Optical Mineralogy and Petrography
- A thin section is a thin slice of rock, typically 0.03 mm in thickness, prepared for examination under a polarizing microscope.
Thickness of a Thin Section
- The typical thickness of a thin section is 0.03 mm, which is the ideal thickness for optimal transmission of light.
Thickness Gauge
- The thickness of a thin section is typically measured using a micrometer or a dial gauge.
Behavior of Light under Polarizing Filters
- When a thin section is placed between two polarizing filters, the birefringence of minerals alters the color and intensity of light.
Purpose of Preparing Thin Sections
- The main purpose of preparing thin sections in petrology is to identify minerals and determine the mineral composition of rocks.
Role of Quartz in Thin Section Preparation
- Quartz is used as a mounting medium in thin section preparation due to its low refractive index, which allows for optimal transmission of light.
Purpose of Photomicrography
- A photomicrograph is used to capture high-magnification images of minerals and rocks, providing a permanent record of observations and allowing for further analysis.
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