Minerals

Minerals


Mineral:: A naturally occurring, usually inorganic, solid consisting of either a single element or a compound, and having a definite chemical composition and a systematic internal arrangement of atoms.

	Pyrite FeS2(member of the sulfides) in unweathered limestone form Cedar Hill, TX.
	Aragonite CaCO3 is an uncommon mineral found in hot spring deposits, volcanic rocks, caves and mines. It too is like Calcite a carbonate.
	Calcite, Gypsum, and sulfur from Cedar Hill, TX. Calcite is from the (carbonates group CaCO3) Gypsum is from the (sulfates group CaSO42H2O).
	Calcite CaCO3 with slicken sides from Cedar Hill, TX. Calcite is from the (carbonates group).
	Dark calcite CaCO3 and weathered limestone from Cedar Hill, TX. Calcite is from the (carbonates group).
	Calcite and Sulfur from Cedar Hill, TX. Calcite is from the (carbonates group CaCO3).
	Massive piece of calcite CaCO3 and some sandy limestone from Cedar Hill, TX. Calcite is from the (carbonates group).
	This is Kyanite Al2SiO5 (it is from the Silicates group) This rock is typically found in aluminum-rich rocks and in the quartz veins that cut through them.
	Light and dark gray calcite CaCO3 with slicken sides mixed also with gray unweathered limestone. from Cedar Hill , TX. Calcite is from the (carbonates group).
	Blue calcite CaCO3 . Calcite is the main element of limestone. Calcite is from the (carbonates group). Calcite is detected within other rocks by applying hydrochloric acid, which causes it to bubble. If you don't have and hydrochloric acid, plane old vinegar will do too.