Luster: Glassy

Streak: None

Hardness: >glass

Breakage: Irregular Fracture

Special Properties: Green, granular appearance; looks like sugar

Luster: Glassy to dull

Streak: None

Hardness: >/=glass

Breakage: 2D at 90⁰

Special Properties: Appears blocky w/greenish tint; looks like a chalkboard

Luster: Glassy to dull

Streak: None/blackish-green

Hardness: >/=glass

Breakage: 2D not at 90^o

Special Properties: Appears splintery; greasy/waxy; looks wet

Luster: Glassy

Streak: None

Hardness: between fingernail and glass

Breakage: 1 directional

Special Properties: Peels in sheets; sparkly flakes; brittle

Used for insulation and electrical

Luster: Glassy

Streak: None

Hardness: >glass

Breakage: 2D at 90^o

Special Properties: Striations; dark colored; looks like fatty-steak; fish scales

Luster: Glassy

Streak: None

Hardness: >glass

Breakage: 2D @ 90⁰

Special Properties: Striations; dark colored; milky looking

Commercial Uses: Jewelry

Luster: Glassy - dull if weathered

Streak: None

Hardness: >glass

Breakage: 2D @ 90⁰

Special Properties: No striations; light colored; salmon colored

Commercial Uses: Porcelain; glazes; insulators; glass

Luster: Glassy

Streak: None

Hardness: >/=fingergail <glass

Breakage: 1 directional

Special Properties: Peels in sheets

Commercial Uses: Cosmetics

Luster: Glassy

Streak: None

Hardness: >glass

Breakage: Conchoidal

Special Properties: Very hard

Commercial Uses: Jewelry; glassmaking

Luster: Glassy

Streak: None

Hardness: >glass

Breakage: Conchoidal

Special Properties: Very hard

Commercial Uses: Collections; electronics; watches

Luster: Dull

Streak: None

Hardness: >glass

Breakage: Conchoidal

Special Properties: sparks and sulfer (match) smell

Commercial Uses: Gravel roads; prehistoric tools

Luster: Glassy

Streak: White

Hardness: >fingernail <glass

Breakage: 3D not @ 90⁰

Special Properties: Reacts with acid; rhombehedral shape

Commercial Uses: Cement

Luster: Dull

Streak: Red-brown

Hardness: >fingernail <glass

Breakage: Irregular fracture

Special Properties: Oolitic

Commercial Uses: Iron ore

Luster: Dull

Streak: White
Hardness: <fingernail

Breakage: Irregular fracture

Special Properties: Greasy or powdery; earthy odor; very smooth; very light

Commercial Uses: Porcelain; make-up; food additive

Luster: Dull

Streak: Faint red-brown

Hardness: >fingernail <glass

Breakage: Irregular fracture

Special Properties: Pisolitic; smells bad

Commercial Uses: Aluminum Ore

*not a true mineral

Luster: Glassy

Streak: White

Hardness: >fingernail <glass

Breakage: 3D @ 90⁰ (cubic)

Special Properties: salty taste; sweats when breathed on; looks like glass

Commercial Uses: Table salt

Luster: Silky

Streak: White

Hardness: <fingernail

Breakage: 1 directional (not visible)

Special Properties: fibrous appearance; looks like peppermint; looks brittle

Commercial Uses: Plaster of Paris; drywall

Luster: Metallic

Streak: Black

Hardness: >/=glass

Breakage: Irregular fracture

Special Properties: Striations; "fool's gold"; cube-y

Commercial Uses: Sulfuric acid

Luster: Metallic

Streak: Black

Hardness: >fingernail <glass

Breakage: Conchoidal

Special Properties: NO striations; spray-painted gold; looks like wet sand

Commercial Uses: Copper ore

Luster: Metallic

Streak: Black

Hardness: >fingernail <glass

Breakage: 3D @ 90⁰ (Cubic)

Special Properties: Very dense; very shiny; gun-metal grey; very heavy

Commercial Uses: Lead ore; batteries

Luster: Resinous

Streak: Pale yellow

Hardness: >fingernail <glass

Breakage: 6

Special Properties: Rotten egg smell when streaked; looks like granite; shiny-glassy

Commercial Uses: Zinc ore

Luster: Pearly

Streak: White

Hardness: <fingernail

Breakage: 1 directional, not visible

Special Properties: Greasy feel

Commercial Uses: Baby powder; cosmetics

Luster: Glassy

Streak: Too hard to leave streak

Hardness: >glass

Breakage: Conchoidal

Special Properties: shiny; burgundy colored; 12-sided

Commercial Uses: Abrasive; gemstones

Luster: Metallic

Streak: Black

Hardness: >fingernail <glass

Breakage: Not visible

Special Properties: Magnetic; looks like pencil lead

Commercial Uses: Iron ore

Luster: Glassy

Streak: White

Hardness: >fingernail <glass

Breakage: 4 directional

Special Properties: sort of clear; color varies a lot

Commercial Uses: Steel production; hydrofluoric acid