Best Arsenate

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Legrandite

Rare zinc arsenate mineral forming bright yellow monoclinic crystals; first described in 1932, with the finest known examples from the Ojuela Mine in Mapimí, Mexico.

Gemstone Collector Yellow Mexico Very Rare Arsenate

6.72 Fair

Adamite

Zinc arsenate hydroxide mineral typically forming yellow-green crystals; notable specimens including pink manganoadamite variety come from Durango, Mexico.

Gemstone Collector Crystal Fluorescent Yellow Green Arsenate

6.55 Fair

Mimetite

A lead chloro-arsenate of the apatite group named from the Greek for 'imitator' due to its resemblance to pyromorphite, typically forming yellow to orange barrel-shaped crystals.

Gemstone Collector Rare Crystal Yellow Orange Arsenate

6.02 Fair

Olivenite

A copper arsenate hydroxide mineral named for its characteristic olive-green color, occurring in oxidized zones of copper-arsenic ore deposits on multiple continents.

Gemstone Collector Olive Green Rare Crystal Arsenate

5.70 Average