Create an account
sphalerite: NM; 3.5-4 Hardness; no cleavage; dark brown-->black; light yellow streak; cubic habit; sulfuric smell
Gypsum: NM; 2 Hardness; Basal Cleavage; translucent white; white streak; scratch with fingernail
Galena: Metallic; 2.5 Hardness; Cubic cleavage; light gray/silver; grey-black streak; very dense; sulfuric smell; not magnetic
Augite: NM; 5.5 Hardness; Prismatic (2D cleavage); Dark green-gray; white streak; glossy; cleavage planes: 93 and 87; Chemical Formula (Ca,Na)(Mg,Fe,Al,Ti)(SiAl)2)O6
Quartz: NM; 7 Hardness; Conchoidal fracture; Clear, purple; no streak; hexagonal habit; Chemical Formula: SiO2
Halite: NM; 2.5 hardness; Cubic cleavage; Clear; white streak; breaks into cubes; salty taste; cubic crystal habit; Chemical Formula: NaCl
Olivine: NM; 7 Hardness; Conchoidal Fracture; Green w/dark speckles; white streak; sandy texture; small crystals; Chemical Composition: (Fe,Mg)2SiO4
potassium feldspar: NM (glossy); 6.5 Hardness; Cubic Cleavage; light pink; no streak; light pink with lighter white part; Chemical Formula: KAlSi3O8
Kaolinite: NM; 2.5 hardness; no cleavage; white with white streak; chalk-like; Chemical Formula: Al4(Si4O10)(OH)8
Sulfur: NM; 1.5-2.5 Hardness; no cleavage; yellow; pale yellow streak; sulfuric smell
Hornblende (amphibole): NM; 5.5-6.5 Hardness; prismatic cleavage at 56 and 124 degrees; dark gray; light gray streak; striations; Chemical Formula Ca2(Mg,Fe)4Al(Si2Al)O22(OH,F)2
Calcite: NM; 2.9 Hardness; cubic cleavage; white and translucent; white streak; effervesces; Chemical Formula: CaCO3
Talc: NM; less than 2.5 hardness; no cleavage; light tan-->white; white streak; soapy feel; scratch with fingernail
Fluorite: NM; 4.5-5.5 hardness; 4 dimensional cleavage; green, blue, white, brown; white streak
Garnet: NM; 6.5 Hardness; no cleavage; some parting; dark red-black; no streak; opaque with translucent red; fractured/parting
Biotite Mica: NM; less than 2.5 Hardness; Basal Cleavage; Bronzey-brown; green streak; brittle, comes off in sheets; peels off
Tourmaline: NM, greater than 5.5 less than 6.5 hardness; poor cleavage; gray-black; black streak; waxy; non-metallic; striations
Hematite: Metallic; 5.5-6.5 hardness; no cleavage; dark metallic gray; light brown streak; slightly magnetic
Corundum: NM; 9 hardness; no cleavage; brown-gray; no streak; hexagonal habit; striated ends
Dolomite: NM; 2.9 Hardness; no cleavage; opaque off-white; white streak; sandy; effervesces when powdered; Chemical Formula CaMg(CO3)2
Plagioclase Feldspar: NM; 6 Hardness; Prismatic cleavage (angles about 90 degrees); dark gray with some green; no streak; looks like oil on water in places (oil marks); Chemical Formula: NaAlSi3O8
Muscovite Mica: NM; less than 5.5 hardness; Basal Cleavage; translucent copper clear sheets; light gray streak; breaks off into thin translucent sheets; Chemical Formula: KAl2(AlSi3O17)(OH,F)2
Staurolite: NM; greater than 6.5 hardness; no cleavage; dark brown; no streak; penetrating twinning; six-sided structure
Chlorite: NM; greater than 6.5 hardness; excellent basal cleavage; transparent green with dark spots; clear flakes; streak is flakes; clean clear sheets
Not on list
Apatite: NM; 5 hardness; conchoidal fracture; lemon yellow or green; white streak; hexagonal; bubbles
Oolitic Limestone: Sedimentary; sand-size particles; bioclastic--> calcite; oolites; effervesces
conglomerate: Sedimentary; gravel-sized particles; detrital--> siliciclastic; rock pieces
Fossilliferous Limestone: Sedimentary; sand-size particles; carbonate and calcite; shells/fossils
Quartzite: metamorphic; non-foliated; fine--> coarse grained; quartz; sandy--> grains don't come off; parent rock: Sandstone
Serpentinite: Non foliated; microcrystalline; green; glassy; conchoidal fracture; serpentine; Parent Rock: Basalt, Gabbro, Ultramafic igneous rocks
chlorite/green schist: foliates: schist-like; quartz; shiny; schistocity; scaly; Parent Rock: mudstone, shale, slate, phyllite
Gneiss: Foliated, banded; quartz; banding, color alternating layers, coarse-grained; Parent Rock: Granite
Anthracite Coal: Non-Foliated; fine-grained; Light, glassy, conchoidal fracture; Parent Rock: Peat, Lignite, Bituminous Coal
Hornfels: Non-Foliated; Microcrystalline; hard, dark, sparkly; contact metamorphism; Parent Rock: Any Rock
Phyllite: Foliated; Schist-like; dark, hard, shiny, phyllitic texture; Parent Rock: mudstone, shale, slate
Soapstone: Non-foliated; microcrystalline; soft, can scratch with fingernail; Parent Rock: Basalt, Gabbro, Dolostone, Ultramafic igneous rocks
Slate: Foliated; no visible grains; shingle-like; flat, slatey, breaks into sheets, cleavage; Parent Rock: Mudstone or Shale
Amphibolite: Foliated or Non-foliated; medium--> coarse-grained; glossy black; blade-like crystals; Parent Rock: Basalt, Gabbro, Ultramafic igneous rocks
Muscovite/Mica Schist: Foliated; medium--> coarse-grained; schist-like; porphyroblasts--> staurolite; Parent Rock: mudstone, shale, slate
White,tan, or cream feldspar
Color: many eps. White
Crystal shape: monoclinic
H:6.5-7.5, S.G:4.31. Color deep purplish red. Usually found in metamorphic rock.
a deep red garnet consisting of iron aluminum silicate
Bright green feldspar
Color: medium ESP. Green
Crystal shape: triclinic
white, powdery variety of calcite. can often form amber-colored hexagonal crystals
specific gravity: 2.54-2.95
crystal shape: orthorhambic
a clay-like mineral, H 1-3 S.g 2-2.5 Luster: dull
It is the main ore for production of aluminum. Note the obvious nodules.
H 3-3.5 S.G. 4.3-4.6 Streak: White, Color: white or colorless mineral (BaSO4). Can be bluish, yellow, brown or reddish. A heavy mineral that can be recognized by its specific gravity (SG). Quartz is harder and not as heavy
H 3.0, S.G. 5.06-5.08 Streak: gray-black Luster: metallic
This beautiful purplish iridescence helps to identify this copper mineral . Sometimes called peacock ore. Untarnished bornite is golden colored
a mineral consisting of sulfides of copper and iron that is found in copper deposits
usually a soft, translucent white or blue
Metallic. H = 3.5 - 4. Streak: dark gray. Color bright silvery gold, tarnishes bronze, brassy gold or iridescent blue-green and red; brittle; No cleavage. Forms dense masses or elongate tetrahedrons.
H: 2.5-3, S.G 8.94, Streak: Black, Luster: Metallic. Native copper looks how we think copper should look. Major deposits of native copper in Keweenaw Peninsula in Michigan.
native crystalline carbon that is the hardest known mineral, that is usually nearly colorless, that when transparent and free from flaws is highly valued as a precious stone, and that is used industrially especially as an abrasive; also : a piece of this substance
Color:Pink, lilac, purple
Streak: white, grey
Breakage: cleavage in two directions
Luster: nonmetallic (vitreous)
Other:small crystals and flaky
Metallic. H = 6 - 6.5. Streak: dark gray. Color silvery gray to black; opaque; forms octahedrons; tarnishes gray. No cleavage; Attracted to a magnet and can be magnetized.
Specific Gravity: 3.6-4.0
Properties/Cleavage: Opaque green. Forms laminations, coatings or masses. No cleavage. Effervesces with HCI.
Mineral Class: Carbonate
Uses: Gemstone, Ore of copper.
NM. H = 5 - 5.5. Streak: white. Colorless to white, orange, yellow, brown, blue, gray, green, or red; may have play of colors (opalescence); cleavage absent. Conchoidal fracture.
Composition: Manganese silicate, sometimes with some calcium, iron, and magnesium
Color: Red, pink, orange-red, and brownish-red. Massive specimens often have black veins running through them. Some Rhodonite specimens tarnish black or brown upon exposure to air.
a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal
color:many esp. blue
crystal system: cubic
This mineral and gemstone is the birthstone for the month of November. It is a silicate mineral of aluminum and fluorine, and comes in a variety of colors, from blue to straw yellow. Name this, with a rank of 8 on the Mohs Scale.
specific gravity: 2.9-3.2
color:many esp. white
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together