Minerals Harder Than Glass Hardness Red to purple to black. Dull earthy does form crystals, but HEMATITE we mostly see the Red to red- 5.5 appearance. finely disseminated brown streak 5.5- Shiny silver; may be weakly SPECULAR metallic luster may be magnetic; massive or crumbly EMATITE very shiny like polished 6.5 H metal, or dull, like Black 1 Dark gray to black; strongly MAGNE- tarnished metal, or even 6.0 powdery like rust streak magnetic TITE fools gold; crystals Greenish 6.0- Pale brass yellow, sometimes often seen, but massive streak finely disseminated, or cubic PYRITE or finely dissem. com.

Good Streak 6.5 Metallic Luster

Cleavages Pink frequently, may be whitish; block; opaque ORTHOCLASE look for flat shiny 90o faces that reflect light White or blue or green MICROCLINE

pure this is white; may Good Dark gray, blueish; striations CALCIC be highly iridescent; common; translucent PLAGIOCLASE striations diagnostic Prismatic 90o White; striations common; SODIC Cleavage translucent PLAGIOCLASE o elongate, shiny two directions of 60 / Black, shiny, long crystals; faces crystals are typical cleavage; third o broken up by many cleavages AMPHIBOLE direction fractures 120 o usually blocky 87 / Dark green to black; often dull; crystals; may be shiny 93o blocky; cleavage hard to find PYROXENE black when fresh

Dark green to black; often dull; ? ? blocky; cleavage hard to see PYROXENE Blood red to green; cleavage-like massive varieties of garnet are common Cleavage fracture; 12 or 24 sided crystals GARNET Not Obvious Pistachio green; crystalline, but EPIDOTE Do not confuse crystal Hardness may be massive or finely growth shape with cleavage! Many 7.5- Bluish-green; weak basal cleavage crystals with good but very flat and shiny BERYL shapes do not cleave 8 Colorless, white, transparent; 8 TOPAZ

perfect basal cleavage Non-Metallic Luster ? ? Brown, pink, blue; 6 sided tapered the red variety is a ORUNDUM ruby 9 crystals common, weak basal parting C

quartz is one of the Clear and glassy, to translucent, most common to frosted, opaque and dull minerals, found in all 6 sided pointed crystals rock types; has many common growth habit, but (weathered and rounded). Many colors/varieties/appea- No irregular specimens with pale colors (gray, white, pink QUARTZ rances chonchoidal fracture, or common); 6-sided crystals but most > Amethyst - violet Cleavage weathered and rounded most > Rose > Smoky common massive w/ chonchoidal fracture. > Milky > etc. Green, glassy, usually granular like sand, or massive OLIVINE