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Calcite: CaCO3 Quartz: SiO2
Comments: Purple-colored druse of amethystine quartz and white calcite. Location: Rio Grande do Sul, Brazil. Scale: Sample size 20 cm. © Dave Barthelmy
Calcite: CaCO3 Beryl: Be3Al2Si6O18
Comments: Transparent emerald, the green variety of beryl on calcite (marble) matrix. Location: Coscuez, Boyacá, Colombia. Scale: 2.5 x 2.5 cm. © Fabre Minerals
Calcite: CaCO3
Comments: White, divergent calcite scalenohedral crystals. Location: Santa Eulalia, Chihuahua, S.A., Mexico. Scale: 8 cm. © Dave Barthelmy
Comments: Cream-colored crystalline aggregate of calcite crystals. Location: Rio Grande do Sul, Brazil. Scale: 20 cm. © Dave Barthelmy