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10 Cards in this Set
- Front
- Back
How to test the hardness of minerals?
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You test the hardness of the mineral by taking a penny and scratching the surface of the mineral, if the penny does leave a etched line in the mineral then that means the hardness of the mineral is less then that of the penny.
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What are the three common types of mineral cleavage?
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1. Flourite
2. Halite 3. Calcite |
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What does conchoidal fracture mean?
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Minerals break with smooth curve surfaces and look like broken glass
EX: Quarts & Olivine |
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What are Striations?
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Parallel lines or bands across the surface of a minerals crystal or cleavage face.
EX: Feldspare |
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How to distinguish Plagioclase feldspar from Potassium feldspar?
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They both have a overlapping range of colors but only Plagioclase has tinnier groves on one cleaveage called striations
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What criteria do we use to classify igneous rocks?
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1. Crystal Size
2. How they relate to each other |
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What is Amygdaloidal Texture?
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vesicles filled in with secondary mineral long after the flow cooled.
EX: Quartz & Calcite. |
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What is porphyritic texture?
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- 2 different kinds of minerals
Pheo Crust & Matrix |
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and what are the two different cooling methods?
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1. underground
2. above ground |
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and what happens during this process?
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underground: phenocrysts formes
above ground: matrix grains crystallize |