"Avantor"

Metamorphosed rock showing foliation and rich in hornblende.

Massive sedimentary gypsum with a moh's hardness 2..

Beautiful deep green, prismatic, crystalline spray.

Polished banded slices with colorful translucence.

Excellet series for college mineralogy and petrology courses.

Hardened natural cement of calcium carbonate that binds other material such as gravel, sand, clay, and silt.

White to gray, medium to coarse-grained, crystalline.

Iron oxide-hydroxide mineral; reddish brown to black color; crystal habit ranges from massive to acicular.

Brazil.

Clear to yellow translucent.

Brownish gray, translucent.

Yellow to orange crystal with a glassy luster and smooth, often transparent appearance.