Mimetite Archives - Cochise College Geology

Mimetite

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Chemical Group: Arsenate

Chemical Formula: Pb₅Cl(AsO₄)₃

Color: Pale yellow, brown, orange yellow, white, colorless

Streak: White or close to it | Fracture: Uneven

Hardness: 3.5 | Specific Gravity: 7.0 to 7.25

Tenacity: Brittle | Cleavage: Imperfect

Crystal Forms: Hexagonal-tripyramidal. Commonly rounded to globular; mammillary crusts. Rounded, barrel-like crystals (campylite)

Mineral Associations: It is found in lead deposits that have undergone secondary alteration. Often found with limonite and carbonates. Commonly occurs with wulfenite.

Identifying Characteristics: Yellow to orange globular clusters; high density.

Uses: Lead ore

Occurrences:
USA
Arizona:Red Cloud Mine, Yuma County, 79 mine, Gila County, Mammoth-St. Anthony mine, Pinal County
Pennsylvania:Wheatley and Charleston mines, Phoenixville
Utah: Tintic district, Eureka

World-Wide
Algeria: Sidi Rouman, Bou-thaleb, and Djebel Grous
Australia:Broken Hill area, New South Wales, Mt. Bonney mine, Price’s Spring Station, Grove Hill, Northern Territory, Tasmania
England:Roughten Gill, Caldbeck Fells, Cumberland, Wheal Alfred, Cornwall region
France:Pontigibaud district, Puy-de-Dome, Les Farges mine
Germany: Johanngeorgenstadt, near Erzgebirge
Mexico: Santa Eulalia, Chihuahua, El Leon mine, San Pedro Mining District, Corralitos, Chihuahua, Bilboa mine, Zacatecas, San Francisco Mine, Cerro Prieta, Magdalena, Sonora, Ojuela Mine, Mapimi, Santa Eulalia
Southwest Africa: Tsumeb

Toxicity: When-swallowed: Very high | When inhaled: Very high

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Photos

Mimetite 1 2 3 4 5 6 7 8 9 10 11 12 13

mimetite-yellow botryoidal-2824 — Mimetite Yellow Botryoidal

mimetite-yellow-botryoidal-22 — Mimetite Yellow Botryoidal

mimetite-yellow-botryoidal-2824a — Mimetite Yellow Botryoidal

mimetite-orange spheres with wulfenite-103d — Mimetite Orange Spheres With Wulfenite

mimetite-orange spheres with wulfenite-103e — Mimetite Orange Spheres With Wulfenite

mimetite-orange spheres with wulfenite-103h — Mimetite Orange Spheres With Wulfenite

mimetite-orange crystals-close view-China-2744a — Mimetite Orange Crystals Close View China

mimetite-orange crystals-close view-China-2747 — Mimetite Orange Crystals Close View China

mimetite-light yellow small crystals-2517 — Mimetite Light Yellow Small Crystals

mimetite-orange crystals-close view-China-2744 — Mimetite Orange Crystals Close View China

mimetite--yellow-botryoidal-2829a — Mimetite Yellow Botryoidal

mimetite-greenish gray crystal clusters-2743 — Mimetite Greenish Gray Crystal Clusters

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