All Rocks and Minerals Definition for Flashcards

Specific gravity 2.7; hardness 3; rock-forming mineral; principal mineral in limestone; opaque and slightly colored by impurities; principal mineral in limestone; used in rangefinders and microscopes.

Rock-forming mineral; primary mineral in igneous rocks; closely related to the amphiboles; complex silicate;

Building material used in drywall; rock-forming mineral; used in plaster; found in massive beds; specific gravity 2.3; hardness 2.

Rock-forming mineral; a group of hydrous silicates containing carbon, magnesium, and iron; hornblende is the most common--black to dark green.

Rock-forming mineral; widespread throughout the earth; valued as gemstone; can generate minor electrical charge; used in making glass; specific gravity 2.7, hardness 7.

Rock-forming mineral; light colored or nearly colorless; easily recognized basal cleavage; silicate mineral always accompanied by aluminum. Specific gravity 2.7-3, hardness 2-2.5.

Rock-forming mineral; aluminum silicate combined with other metals; potash, widely dispersed, perhaps even more than quartz. Specific gravity 2.5, hardness 6.

Rock-forming mineral; aliminum silicate combined with other metals; specific gravity 2.6, hardness 6; major substance on the highlands of the moon's surface; crystal lattice structure.

Ore of common metal; specific gravity 2-2.5; hardness 1-3; used in industry as light, strong metal formed in weathered volcanic rock; hundreds of years worth of aluminum ore are in the earth's crust.

Ore of common metal; specific gravity 7.5; hardness 2.5; very abundant; cubic crystal system;

Ore of common metal; specific gravity 5.3; hardness approximately 6; magetic when heated; very abundant; causes red coloring in many rocks, including those on the surface of Mars. (rock is on left in photo)

Ore of common metal; specific gravity 4.7; hardness 1-2; a soft, black to dark gray mineral; brittle;

Ore of common metal; specific gravity 5.2; hardness 6; black or brownish-black with a metallic luster; often found in beachsand; stable at high temperatures; magnetic.

Ore of common metal; specific gravity 8.9; hardness 2.5-3; very high thermal and electrical conductivity; turns green in the presence of oxygen;

Ore of common metal; "fool's gold"; specific gravity 5; hardness 6-6.5; actually found in the same spots as gold at times;