Quiz 11/17/2016 formation Flashcards

1
Q

corundum

A
  • meta of limestone or dolostone
  • cooling of magma
  • crystals form inside as the Al oxide cools

IG, SED, META

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2
Q

hematite

A

-weathering/hydrothermal alteration of iron-bearing minerals

IG, SED, META

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3
Q

ilmenite

A
  • common accessory min in ig and meta
  • crystallizes out of magma
  • magmatic segregation occurs in layers
  • pegmatites

IG, META

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4
Q

magnetite

A
  • very common accessory min found in ig and meta
  • contact meta (ig intrusions) produces replacement deposits of magnetite

IG, META

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5
Q

pyrolusite

A
  • hydrothermal replacement deposits
  • acid rich bogs

IG, SED, META

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6
Q

spinel

A
  • meta min in aluminous meta rocks
  • regionally meta limestone and dolostone
  • large scale heat and pressure

META

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7
Q

graphite

A
  • a result of decomposition of organic material deposited in the sediment
  • in pelitic meta rocks; phyllite, slate, schist, marble

IG, META

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8
Q

copper

A
  • common in volcanics
  • reaction between Cu-bearing/Fe-bearing solutions
  • fills vesicles/cracks
  • native Cu may be in oxidized zone of Cu-bearing hydrothermal sulfide deposits
  • associated with chalcocite, bornite, epidote, calcite, chlorite, zeolites, cuprite

IG, SED, META

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9
Q

molybdenite

A
  • hydrothermal veins
  • disseminated deposits
  • pegmatites and porphyry Cu deposits

IG, META

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10
Q

realgar/orpiment

A

-hydrothermal deposits with lead, silver, gold

IG, SED, META

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11
Q

sphalerite

A
  • common constituent of hydrothermal sulfide deposits
  • can be an accessory min in felsic ig rocks/coral beds
  • associated w/ galena, pyrite, chalcopyrite, pyrrhotite

IG, SED, META

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12
Q

galena

A
  • very common in hydrothermal sulfide deposits
  • associated with sphalerite, pyrite, chalcopyrite, quartz, calcite, fluorite, barite
  • used in automobile batteries

IG, META

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13
Q

chalcopyrite

A
  • most common in Cu-bearing minerals
  • hydrothermal sulfide deposits
  • found in some mafic rocks

IG, SED, META

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14
Q

pyrrhotite

A
  • common in high temp hydrothermal sulfide deposits and mafic/ultramafic ig rocks
  • bodies formed (can be) by segregation of sulfide melt from silicate melt
  • pegmatites
  • associated with pyrite, marcasite, chalcopyrite
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15
Q

pyrite

A
  • most common sulfide mineral
  • found in hydrothermal deposits
  • ig rocks common
  • common in shales and coal

IG, SED, META

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16
Q

geothite

A
  • weathering
  • alteration of Fe-bearing minerals
  • hydrothermal replacement deposits

IG, SED

17
Q

limonite

A
  • alteration of iron min
  • large masses of limonite produced by alteration and oxidation of pyrite in hydrothermal sulfide deposits
  • weathering of Fe-bearing min

iron ore

18
Q

bauxite

A
  • from soil that has been leached of silica
  • secondary min forming in the weathered surface zones in clay deposits/limestones and low silica ig

IG, SED

19
Q

halite

A
  • abundant in marine evaporite deposits
  • found in saline lake deposits

SED

20
Q

sylvite

A

-evaporite deposits such as dry lakes and saline lake shorelines, salt beds and volcanic fumaroles

IG, SED

21
Q

fluorite

A
  • hydrothermal ore veins
  • sed deposits
  • pegmatite dikes

IG, SED, META