Adamite
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Adamite is a zinc arsenate hydroxide mineral, Zn2AsO4OH. It is a mineral that typically occurs in the oxidized or weathered zone above zinc ore occurrences. Pure adamite is colorless, but usually it p
Yellow-green adamite in limonite
Adamite on limonite from the Gold Hill District Tooele County, Utah, US. Scale at bottom is c. 2.5 cm.
Mohs scale
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The Mohs scale of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.
Adamite
…in druses and radiating clusters; also smooth botryoidal masses Cleavage {101}, good; {010}, poor Fracture Uneven to subconchoidal Tenacity Brittle Mohs scale hardness 3.5 Luster Vitreous Streak White to pale green Specific gravity 4.32–4.48 measured Optical properties Biaxial (+/−) Refractive index nα=1.708…
Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale
Talc block
Gypse Arignac
Calcite sample 2