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Bucket O' Minerals
Fifteen minerals that are important to identify
15
Geology
Undergraduate 1
02/08/2013

Additional Geology Flashcards

 


 

Cards

Term
Quartz
Definition

[image]

Colorless or white, many colors

pale or colorless

glassy

7

conchoidal fracture

6 sided prism

Term
Plagioclase Feldspar
Definition

[image]

commonly gray, but ranges from white to dark gray

pale to colorless

pearly to glassy

6

good cleavage in 2 directions at about 90

striations on some cleavage planes, one variety has peacock blue irridescence

Term
Potassium Feldspar
Definition

[image]

white, creamy, pink, gray, green, brick red

pale to colorless

pearly to glassy 

good cleavage in 2 directions - 90 

no striations, but does have non-parallel streaks

Term
calcite
Definition

[image]

usually colorless, may be a variety of colors

white

glassy

3

3 directions good cleavage

fizzes in HCL

Term
Halite
Definition

[image]

gray, white, yellow, blue, purple

white

glassy

2.5

3 perfect at 90

cubic, granular massive

water soluble, tastes salty

Term
Olivine
Definition

[image]

olive green to grayish green

pale to colorless

glassy

6.5-7

non, conchoidal fracture

usually green but occurs with other dark minerals

Term
biotite
Definition

[image]

dark green, brown to black, thin sheets a smoky color

pale to colorless 

pearly to glassy

2.5-3

one perfect cleavage direction

Term
Muscovite
Definition

[image]

colorless, white, grey

pale to colorless

pearly to classy

2-3

one perfect cleavage direction

Term
Amphibole
Definition

[image]

dark green to black

pale to colorless

pearly to glassy 

5-6

good cleavage in 2 directions at ~ 60, 120

cleavage can appear fiborous

Term
Pyroxene
Definition

[image] 

 

dark green to black

pale to colorless

pearly to glassy 

5-6

good cleavage in 2 directions at ~ 90

cleavage can appear fiborous

 

Term
Gypsum
Definition

[image]

white, transparent

white

pearly to glassy

2

3 directions good cleavage, ~60 and 90

 

Term
Garnet
Definition

[image]

red, brown, yellow, white, green, black

white

pearly to glassy

6.5-7.5

none

12 sided crystal

Term
Pyrite
Definition

[image]

pale brass yellow

greenish black

metallic

6-6.5

poor, conchoidal fracture

typically cubic

Fool's Gold

Term
hematite
Definition

[image]

red, brown, silver, gray

light to blood red

earthy to metallic

5.5-6.5

none

always has red streak

Term
magnetite
Definition

[image]

dark gray to black

black

earthy but can be metallic or a combo

5-6

none

Magnetic and Heavy

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