Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A dense tetragonal polymorph of quartz that is formed under great pressure and is often associated with meteoroid impact.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A fine-grained
mineral ,Si O 2, that is apolymorphic form ofquartz formed under very highpressure .
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
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Examples
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To distinguish between just another lake and an impact crater, one might look for stratigraphic evidence of impact debris at the bottom of the lake or in the area immediately surrounding the lake, evidence of disruption of the local bedrock (for example, the stratigraphic sequence at Barringer Crater in Arizona was folded over on itself in the area immediately around the crater), and for high pressure / low temperature mineral species such as stishovite (a high pressure / low temp polymorph of quartz which is considered diagonistic of impact events).
RealClimate 2009
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To distinguish between just another lake and an impact crater, one might look for stratigraphic evidence of impact debris at the bottom of the lake or in the area immediately surrounding the lake, evidence of disruption of the local bedrock (for example, the stratigraphic sequence at Barringer Crater in Arizona was folded over on itself in the area immediately around the crater), and for high pressure / low temperature mineral species such as stishovite (a high pressure / low temp polymorph of quartz which is considered diagonistic of impact events).
RealClimate 2009
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Although ferromagnesian silicate spinels (such as ringwoodite) were later found to break down to simple oxides or stishovite plus perovskite, several post-spinel oxides experimentally convert into a single phase with the CaFe2O4-type and CaTi2O4-type structures.
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Although ferromagnesian silicate spinels (such as ringwoodite) were later found to break down to simple oxides or stishovite plus perovskite, several post-spinel oxides experimentally convert into a single phase with the CaFe2O4-type and CaTi2O4-type structures.
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Although ferromagnesian silicate spinels (such as ringwoodite) were later found to break down to simple oxides or stishovite plus perovskite, several post-spinel oxides experimentally convert into a single phase with the CaFe2O4-type and CaTi2O4-type structures.
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