click below
click below
Normal Size Small Size show me how
Big Nine Minerals
Mineral | Qualities |
---|---|
Quartz | Hardness = 7 conchoidal fracture no cleavage color varies, often white or clear |
Potassium Feldspar | Hardness = 6 2 directions of cleavage at 90° perthitic ingrowths are common typically salmon pink color |
Plagioclase | Hardness = 6 2 directions of cleavage at 90° striations may be seen on cleavage surface white or gray color |
Biotite | Hardness = 2(1/2) - 3 one perfect direction of cleavage peals into thin, flexible sheets black color |
Muscovite | Hardness = 2 - 2(1/2) One perfect direction of cleavage peals into thin, flexible sheets clear or translucent color |
Olivine | Hardness = 7 conchoidal fracture no cleavage apple green or yellowish green color |
Pyroxene | Hardness = 5 - 6 (or 6(1/2)-7) 2 cleavages at about 90° dark or dull green color |
Amphibole | Hardness = 5 - 6 2 directions of cleavage at 120° and 60° perfect cleavage black to dark green color |
Calcite | Hardness = 3 3 directions of perfect cleavage, rhombic cleavage reacts with HCl often white |