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Pat Minerals

Minerals

MineralDescription
K-Feldspar Leucocratic | Harder than Glass | 4 degrees of clean cleavage on four sides, rough edges on two
Quartz Leucocratic | Harder than Glass | 6 sided crystal, no cleavage, conchoidal fracture
Halite Leucocratic | Softer than Glass | is salt essentially tastes, dissolve in water | perfect cubic cleavage
Gypsum Leucocratic | Softer than Glass | 1 degree cleavage, flaky | partial cleavage to two directions, rough, but present edges
Muscovite Mica Leucocratic | Softer than Glass | 1 degree cleavage, flaky | rough edges
Calcite Leucocratic | Softer than Glass | 3 degree cleavage, rhomboidal or diamond ish, not square | bubbles with acid
Talc Leucocratic | Softer than Glass | one plane of cleavage, flaky, very soft
Biotite Mica Melanocratic | Softer than Glass | 1 perfect degree of cleavage | thin flexible sheets
Hematite Metallic | red streak
Malachite Metallic | green everywhere color and streak | earthy green, noncrystalline
Galena Metallic | Black Streak | perfect cubic cleavage | shiny
Granite Felsic (light color) | Phaneritic | Visible quartz crystals | small black spots
Basalt Basic composition | Black color | Aphinitic | May have phenocrysts of olivine
Gabbro Phaneritic | Porphyritic | Basic Mafic | Black Chunks Lighter Ground Mass
Pumice Vesicular | Spongy like | light gray | Felsic
Scoria Larger Vesicles | Dark color like black or dark red like rust
Pegmatite clump of crystals | porphyritic | Phaneritic | crystals such as quartz, biotite, feldspar
Obsidian Black Glass | conchoidal fracture | May be red or clear
Conglomerate Typically Gray | ROUNDED clasts | fine ground mass
Breccia ANGULAR clasts | fine gound mass
Arkose Course Angular Grains | some quartz | Maybe Micas
Sandstone If Quartz (fine grained very white cream color, SANDY) | Ferruginous (Dark redish color from iron content)
Shale VERY fine grain, smooth texture | bedding planes very easily separated | dark tan to black
Chalk Chalky, very light, very soft | white
Oolitic Limestone almost like full of styrafoam beads | Small rounded grains throughout
Shelly Limestone rock with shells embedded IN IT
Coquina rocks MADE FROM smashed shells
Coal Very dark black | maybe shiny where broken | will get your hands dirty
Rock Salt Alot like halite | might be more rounded | Less clear\white maybe pink or grey
Slate Foliate (Layered) | Dense (Fine Grained) | Dull Luster | Dark color
Phyllite Foliate | Dense | Satiny Luster | More Tan color
Schist Foliate | Granoblastic | Fissile (Mica ish)
Gneiss Foliate | Granoblastic | Solid Layered
Marble Non Foliate | Granoblastic | multiple minerals, may have streak
Quartzite Non Foliate | Granoblastic | Like sandstone, but no layers
Popular Earth Science sets

 

 



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