The Minerals

Streak: Greenish-black Brssy yellow color; striated, cubic crystals; no cleavage; H=6-6.5; resmbles gold and somtimes reffered to as "fools gold"; very common; sulfde; economic use: sulfuric acid(industry, batteries)

Pyrite

Crystals and crystalline varieties can vary in color; crystals present with 6 sided prismatic habit terminated by 6- sided triangular faces; often striated crosswise; conchordial fracture; vitreous to waxy to greasy luster; H=7; brittle tenacity; silicate; economic use: crystals, industry, abrasive other use: rock former

Quartz (Macrocrystalline)

What kind of luster does Sphalerite have

Resinous

Yellowish brown; cleavage in six directions; resinous luster; H=3.5-4; brownish yellow to light yellow streak; rotten egg odor when scratched; sulfide; economic use: Zinc ore; nonmetallic luster; softer than glass

Sphalerite

Streak-Yellow Bright yellow color; uneven fracture; H=1.5-2.5; resinous luster; native element ; transparent to translucent diaphaneity; extremely flammable in certain conditions; economic use: sulfuric acid, fertilizers, pharmaceuticals, gunpowder, insecticides

Sulfur

White to pink or green; perfect cleavage in one direction (basal); pearly luster; H=1 sectile tenacity; soapy to greasy feel; commonly found in foliated masses; silicate; Economic use: powder; nonmetallic luster; softer than glass

Talc

Gypsum has what hardness level

2

Halite has a hardness of

2.5

What is the hardness of biotite

2.5-3

Halite has cleavage in how many directions

3

Sphalerite has what hardness level

3.5-4

Sphalerite has cleavage in how many directions

6

Some shade of green or brownish red: H=5 ; vitreous to subresinous to dull luster; phosphate; economic use: fertilizer; non metallic luster; softer than glass

Apatite

Pyroxene Group Dark green to black color; two directions of cleavage at nearly 90 degrees; H=6; short, stubby crystals; waxy to dull luster; silicate; ferromagnetism mineral; use: rock former; non metallic luster; harder than glass;

Augite

Brown to greenish black to black; Cleavage in one direction (basal); H=2.5-3; elastic tenacity; commonly occurs in books; silicate;ferromagnetism mineral;economic use: lubricant nonmetallic luster; sofeter than glass

Biotite

Colorless to white, yellow, pink, blue to gray or brown; cleavage in three directions at approximately 75 degrees (rhombic); vitreous, waxy, or dull luster; H=3; readily effervesces with acidic solutions; transparent to opaque; carbonate; use: rock former; nonmetallic luster; softer than glass

Calcite

Streak: Greenish- black Gloden yellow to copper color; tarnished blue to purple; H=3.5-4; sulfide; economic use: copper ore

Chalcopyrite

Streak: Copper Red Copper red color on fresh surface, dull brown on a tarnished surface; uneven fracture; H=2.5-3; metallic luster; native element; malleable tenacity; conductive; economic use: wiring industry, metal alloys, cooking utensils, heat exchangers

Coper

Gray to red to blue to white color; striated barrel-shaped crystal; 6 sided; dull luster in hand samples; adamantine to vitreous luster in gemstones H=9; oxide; economic use: abrasive, jewelry (sapphire- blue, ruby-red)

Corundum

Wide color variation but frequently white to pink; cleavage in three directions at approximately 75 degrees (rhombic); vitreous to pearly luster; H=3.5-4; effervesces in acidic solutions only if powdered; transparent to translucent to opaque; carbonate; use: rock former; nonmetallic luster; softer than glass

Dolomite

What kind of tenacity does biotite have

Elastic

Gypsum has what tenacity

Flexible

Colorless to yellow, blue, green, gray or violet; four directions of cleavage; H=4; transparent to translucent; usually fluorescent; halide; economic use : flux in steel making; non metallic luster; softer than glass

Fluorite

Streak: Gray Silver gray color, cleavage in 3 directions at 90 degrees(cubic); heavy, H=2.5; sulfide; economic use: lead ore

Galena

Deep red to reddish brown color; conchordial and uneven fracture; vitreous luster, H=7; brittle tenacity; silicate; ferromagnetism mineral; economic use; jewelry(pure samples) or abrasive (impure samples). Dodecahedral crystals(12 sided) are common; crystals are generally tan to greenish tan in color and can vary in size

Garnet

Gypsum has what kinds of cleavage

Good in one direction, poor in two

Streak: Black to steel gray Dark gray to black; uneven fracture; micaceous tendency; H=1-2; metallic to sub-metallic lister; native element; economic use: lubricant, pencils

Graphite

Colorless to white to light colors; cleavage good in one direction, poor in two others; vitreous, pearly, or silky luster; H=2; flexible tenacity; transparent to opaque; sulfate; economic use: soil conditioner, sheet rock, plaster of paris; nonmetallic luster; softer than glasss

Gypsum

Colorless to white to light colors; cleavage in three directions(cubic) H=2.5; soluble in water; salty taste; transparent to translucent; halide; economic use: salt, preservative; nonmetallic luster; softer than glass

Halite

Red to reddish grown to black; H=1.5; dull to earthy luster although some specimens can have a submetallic appearance; reddish brown streak; oxide; economic use: iron ore; nonmetallic luster; softer than glass

Hematite

Streak: Reddish Brown Steel gray to reddish black; uneven fracture; metallic variety is referred to as a specular hematite ; H=6; oxide; economic use: iron ore

Hematite (Specular)

Amphibole Group Dark green to black color; two directions of cleavage at 60 and 120 degrees; H=5.5; waxy to dull luster; may present in splintery or fibrous appearance; crystal tend to be long in habit; silicate; ferromagnetism mineral; use: rock former; nonmetallic luster; harder than glass

Hornblede

Yellow to yellowish brown; H=1.5; dull to earthy luster; yellowish brown streak; oxide; economic use: iron ore; nonmetallic luster; softer than glass

Limeonite

Streak: Black Dark gray to black; uneven fracture; heavy H=6; magnetic properties; oxide; economic use; iron ore

Magnetiet

Colorless; cleavage in one direction (basal); H=2-2.5; Transparent in thin sheets; elastic tenacity; commonly occurs in books; silicate; economic use: insulation, lubricant; nonmetallic luster; softer than glass

Muscovite

Olive green colored, small, glassy grains; conchoidal fracture; vitreous luster; H=6.5-7; brittle tenacity; silicate; ferromagnetism mineral; economic use: jewelry (peridot), rock former; nonmetallic luster; harder than glass

Olivine

Biotite has cleavage in how many directions

One

Feldspar Group Pink, white, or green color; cleavage in two directions at nearly 90 degrees; perthitic inter growths on both cleavage faces; H=6-6.5; pearly to waxy to vitreous luster; silicate; use: rock former; nonmetallic luster; harder than glass

Orthoclase

What kind of luster does gypsum have

Pearly vitreous luster

Feldspar Group White to blue-gray color; cleavage in two directions at nearly 90n degrees ; striations on one cleavage face; H=6-6.5; pearly to waxy to vitreous luster; silicate; use: rock former; nonmetallic luster; harder than glass

Plagioclase