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Geo Lab test 2
Rock Textures and Minerals
16
Geology
Undergraduate 1
02/20/2012

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Term
Detrital
Definition

sedimentary rocks, "weather-worn", large pieces of detritus cemented by calcite, quartz or hematite

 

conglomerate rocks

Term
Interlocking Textures
Definition

different  minerals fused together in a jigsaw like pattern, cleavage planes look sparkly

 

igneous rocks

Term
Foliated Texture
Definition

metamorphic rock; minerals have grown parallel to each other like layers

 

metamorphic rock

Term
quartz(milky)
Definition
hardness = 7, non-metallic, conchoidal fracture
Term
hematite
Definition
earthy/metallic, 2.5 hardness, fracture, red-brown streak
Term
pyrite
Definition
metallic, 6 hardness, no cleavage, gray, grows in cubes
Term
muscovite mica
Definition
non-metallic,  2 hardness, 1 plane(sheet) cleavage, transparent property
Term
biotite mica
Definition
non-metallic, black color, 2 hardness, 1 plane cleavage, 
Term
gypsum
Definition

non-metallic, 2 hardness, 3 cleavage(1 good 2 poor)

 

Term
talc
Definition
non-pearly, 1 hardness, foliated(1 poor), soapy feel
Term
plagioclase feldspar
Definition
non-metallic, 6 hardness, 2 90-degree cleavage. striations
Term
k-feldspar
Definition
non-metallic, 6 hardness, 2 90-degree cleavages, exsolution lamellae
Term
amphibole
Definition
non-metallic, 6 hardness, 2 cleavage(60 and 120 degrees), elongate crystals
Term
calcite
Definition
non-metallic, 3 hardness, 3 cleavage(rhombic), reacts to HCL
Term
galena
Definition
metallic, 2.5 hardness, 3 cleavage (cubic), dense
Term
halite
Definition
non-metallic, 2.5 hardness, 3 (cubic) cleavage, salty taste
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