Rock and Minerals Flashcards

is a metallic. Very dense, gray, shiny, sulfide mineral. PbS

Leaves a black streak, metallic group, oxide mineral, Fe3O4 (is magnetic)

Gray streak, blackish gray, metallic group, native element (you can write with it) C

red and black, leaves a red streak, metallic group, oxide mineral. Fe203

black with gold, metallic group, black streak, fools gold, sulfide mineral FeS2

Silicate mineral, Dark, red, glassy, non-metallic group, brittle Fe, Mg, Ca, Al

Salty Taste, not very dense, clear in color, cubic cleavage, halite mineral NaCl

scratch with fingernail, non-metallic, light, sulfate mineral, soft, CaS04 2H20

Reacts with HCL, white, brown, clear, perfect cleavage, no 90 angles, carbonate mineral CaCO3

Purples, blues, yellow, clear, non-metallic, Illinois state mineral, soft, cleavage, halide mineral CaF2

Silicate mineral, always olive green, isolated tetrahedral, no cleavage, hard, non-metallic group MgFe

dark mica, silicate, cleaves into thin sheets, non-metallic group, KMgFeAl,

light mica, silicate, breaks into thin sheets, cleavage, soft, non-metallic group, Al

pink and salmon colored, planes at 90, milky, silicate, non-metallic group, K Al

SiO2, silicate mineral, non-metallic group, pink, purple, brown, clear, breaks into sharp edges, crystals, no cleavage, hard

phaneritic, silicic, felsic, light colored, Quartz. K-feldspar

crystals not visible, (aphanitic or porphyritic) silicic, felsic, light colored, quarts, K-feldspar

Intermediate, gray, phaneritic, K-feldspar, plagioclase feldspar, Biotite, quartz, augite

Intermediate, gray, porphyritic, or aphanitic, K-feldspar, plagioclase feldspar, biotite, quartz

Mafic, dark brown or black, phaneritic, Ca-plagioclase, Olivine,

Mafic, dark brown or black, Porphyritic or aphanitic, Ca-plagioclase, Olivine

Solid Glass, no crystals present

Vernacular Glass, gray to tan

Clastic , coarse grained, rounded clasts,

Coarse grained, angular clasts

Medium grained, mostly quartz

Medium grained, feldspar, Quartz,

Dirty sandstone, medium grained, quartz, rock fragments,

Very fine grained, very fine grained, clay minerals, and sometimes quartz

swamp environments, decomposed plant material, black often shiny, organic carbon

calcite

Halite

SiO2

alternating light and dark bands
light bands: quartz and feldspar
Dark bands: hornblende, augite, garnet, biotite, etc.

Sheet-like grains; scaly, "shitose" texture. Sparkly or shiny appearance. ("Shiny Schist")
minerals: biotite, muscovite, chlorite. Minor amounts of quartz, or dark silicate minerals

microscopic flakes of mica create a sheen (slight reflective surface)

parallel orientation of of mica flakes created "slatey cleavage" planes of weakness

very hard (scratches glass). visible grains of quartz