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11 Cards in this Set
- Front
- Back
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What is the order of Timescale periods? |
Cambrian, Orducvian, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Crestatious, Paleogene, Nelgene, Quarnary. |
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Which Era do Triassic, Jurassic and Crestatious belong too? |
Mesozoic |
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What Era do Permian, Carboniferous, Devonian belong to? |
Palaeozoic |
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What Era do Quaternary, neogene and palaeogene belong too? |
Cenozoic |
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What are the two Eons? |
Precambrian and Phanerozoic |
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What is relief in mineral optics? |
Ita a relative observation used when observing minerals through a microscope |
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Whats classed as high relief? |
When the mineral grains have a different refractive index to the mounting glue. |
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What is the difference in opaque minerals and isotropic minerals? |
Isotropic mineral only appear black in XP, Where opaque appear black in both Plain Polarised Light and Cross Polarised light. |
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Sequence of interferience in minerals is significant because? |
The highest order of colours xan be diagnostic of minerals. |
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What property do isotropic minerals have in optics? |
They have extinction at four points of rotation during a 360 degree turn, this show that this mineral belongs to the cubic system. |
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Anisotropic minerals will have the four positions of darkness but will also have? |
Interference colours. |
