Minerals for Geology

For Midterm

15 cards   |   Total Attempts: 183
  

Cards In This Set

Front Back
Question 1
Hardness of 6. cannot be scratched by streak plate, Silicate Felsic,2 cleavages at ~90
Potassium Feldspar
Question 2
Felsic, silicate, Hardness of 6 cannot be scratched by streak plate. 2 cleavages at ~90; often white to gray with striations
Plagioclase
Question 3
Felsic Silicate, Hardness of 2.5 i.e scratch with fingernail. Cleavage forms in sheets; light brown to colorless;
Muscovite
Question 4
Mafic silicate; H-7 cannot be scratched by streak plate, Conchoidal fracture, no cleavage, forms small “sand grain” crystals, Green mostly
Olivine
Question 5
Mafic Silicate; H-5.5-6 can scratch glass/scratched with masonry nail or knife blade, 2 good cleavages at 87° and 93, short blocky prisms, dark green to black
Pyroxene (Augite)
Question 6
Mafic Silicate H-5.5 can scratch glass/be scratched with masonry nail and knife blade, 2 good cleavage at 60° and 120°, dark gray to black, has needle-like prisms

Amphibole (Hornblende)
Question 7
Mafic Silicate; H-2.5-3 can be scratched with fingernail, 1 excellent cleavage forms sheets, black to brown-black
Biotite
Question 8
Felsic; non silicate; non metallic; H-3 can be scratched with a penny, 3 excellent cleavages at 75° to form rhombohedrons, colorless to white
Calcite
Question 9
Felsic; Non silicate; non metallic' H-3.5 can be scratched with little nail, 3 good cleavages not at 90° and often at 75° All colors, gray to white most common.
Dolomite
Question 10
Felsic Non silicate, non metallic, H-2.5: scratched by fingernail; Clear; Tastes like salt. N
Halite
Question 11
Felsic; Non silicate; non metallic; H-2 Cleavage good but variable between varieties; scratch w/ fingernail, transparent to white
Gypsum
Question 12
Felsic; Non silicate; non metallic. H-1
Talc
Question 13
Fools gold
Pyrite
Question 14
Metallic H-2.5, good cleavage in 3 directions, silver gray, Very high Sp. Gr. Of 7.5
Galena
Question 15
Metallic H-5-6, Color silver to gray to reddish; reddish brown streak
Hematite