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Minerals
W&M mineral quiz 1
14
Geology
09/26/2011

Additional Geology Flashcards

 


 

Cards

Term

Hardness

 

Definition

scratching substance of known hardness with mineral of unknown hardness 

Fingernail 2.5

Copper Penny 3.5

Wire Pick 4.5

Glass plate 5.5

 [image]

Term
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Definition

Quartzite

sugary

medium grain size

Scratches glas

oily luster

Term
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Definition

Hematite

2.5 Hardness

Earthy luster (redish)

leaves red brown streak

2d cleavage

Term
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Definition

Pyrite

metalic luster

grows in cubes

streak is gray

hardness is 6 scratches glass

"fools gold"

Term
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Definition

Muscovite Mica

Hardess is 2 fingernail scratches it

transparent thin sheets

1 cleavage

brown or red brown

Term
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Definition

Biotite Mica

fingernail scratches it

opaque black in color

breaks into thin sheets

Term
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Definition

Gypsum

hardness 2

breaks into sheets

rhombus

transparent to opaque

Term
[image][image]
Definition

Talc

opaque 

greasy soapy feel

scratches off into powder

Term
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Definition

Plagioclase Feldspar

Hardness 6 Scratches glass

breaks along 2 planes at 90 degrees

striations on cleavage surface

white or gray

Term
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Definition

K-Feldspar

Breaks along 2 cleavage plains at about 90 degrees

muscle fibers run along cleavage plain

orange, brown, pink

Term
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Definition

Amphibole
black color

breaks along 2 cleavage plains at 60 degrees and 120 degrees

splintery cleavage

gray/green streak 

Term
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Definition

Calcite

hardess 3

Breaks aling 3 clevage plains

rhombic shape

reacts to HCL

colorless, white, yellow

Term
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Definition

Galena

Hardness 2.5

verry dense 

breaks along 3 clevage plains making a cube

metalic luster

bright silvery gray

Term
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Definition

Halite (rock salt) 

hardness 2.5

Breaks along 3 clevage plains, cube

opaque

colorless, yellow, or brown