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Mineralpedia Details for Mimetite

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Mimetite

Mimetite

Named after the Greek word mimitis, meaning “imitator,” as Mimetite often imitates or mimics pyromorphite. Mimetite has many localities worldwide, however some well crystallized material comes from localities in Germany, the Czech Republic, England, Scotland, Namibia, Iran, the USA, Mexico, Australia, and Thailand. Widespread and found as a secondary mineral in the oxidation zone of lead-bearing ore deposits. Crystals ae millimetric to centimetrix in size, usually forming stout, hexagonal crystals with pinacoids but often with pyramidal terminations, often barrel-shaped to globular. Can be acicular in radial sprays. Colors are typically yellow to deep yellow, orange to bright orange and burnt orange, can be green.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)
Encyclopedia of Mineralogy, 1st edition Roberts & Rapp (1974).
Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/mimetite.pdf

Formula
Pb5(AsO4)3Cl 
Crystal System
Hexagonal 
Crystal Habit
Reniform, Globular, Prismatic 
Cleavage
Imperfect, None, None 
Luster
Adamantine - Resinous 
Color
white, yellow, orange, brown, red 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
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Mimetite from Mina Ojuela, Mapimi, Durango, Mexico

Mimetite
            from Mina Ojuela, Mapimi, Durango, Mexico

Deep yellow crystal groups to 8mm and bright yellow and green, acicular Mimetite crystals to 1mm covering the large cavit with Wulfenite.

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Mimetite from Mt. Bonnie mine, Grove Hill, Northern Territory, Australia

Mimetite
            from Mt. Bonnie mine, Grove Hill, Northern Territory, Australia

Hony colored hexagonal crystals to 4mm.

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Mimetite from San Pedro Corralitos, Chihuahua, Mexico

Mimetite
            from San Pedro Corralitos, Chihuahua, Mexico

Mimetite from San Pedro Corralitos is somewhat of the standard for the species. It is highly coveted for its candy-like yellow botryoidal crystals. This specimen has a shimmer or chatoyancy that catches the light when turned. The single botryoids are about 3-5mm across.

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Mimetite from Penberthy Croft mine, St. Hilary, Cornwall, England

Mimetite
            from Penberthy Croft mine, St. Hilary, Cornwall, England

Light green Mimetite crystals scattered on the upper surface of a quartz-vein matrix. The Mimetite crystals are the classic barrel-shaped, curved crystals and typically measure about 1mm. All of the crystals grade to colors of yellow, green, cream or buff and show a brilliant subadamantine luster.

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Mimetite from San Rafael mine, Nye Co., Nevada, United States

Mimetite
            from San Rafael mine, Nye Co., Nevada, United States

Partial sixling Cerussite crystals to 4-5mm completely overtaken by light yellow almost white Mimetite crystals. 

 The large crystals are pseudomorphs of Cerussite replaced by Mimetite to 1.2cm.

Light yellow, stubby, hexagonal crystals of Mimetite encrusting and replacing Cerussite sixling twins to 4mm.

Unsual pseudomorphs of yellowish to greenish yellow minute, hexagonal Mimetite crystals replacing twinned Cerussite crystals to 7mm.

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Mimetite from Dry Gill mine, Caldbeck Fells, Cumbria, England

Mimetite
            from Dry Gill mine, Caldbeck Fells, Cumbria, England

Burnt orange "balls" of Mimetite variety "Campylite" to 5mm.

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Mimetite from Rožná dep., Vysočina, Moravia, Czech Republic

Mimetite
            from Rožná dep., Vysočina, Moravia, Czech Republic

Fiery orange fibrous crystals to 2mm with translucent, tabular Wulfenite crystals to 2mm.

1mm acicular Mimetite sprays associated with Wulfenite.


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Mimetite from Richmond Sitting Bull mine, Galena, Lawrence Co., South Dakota, United States

Mimetite
            from Richmond Sitting Bull mine, Galena, Lawrence Co., South Dakota, United States

Yellow acicular crystals to 3mm.

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Mimetite from Tsumeb mine, Tsumeb, Namibia

Mimetite
            from Tsumeb mine, Tsumeb, Namibia

Honey yellow "jackstraw" like bunch of prismatic crystals tapering to a point.

Honey yellow perfectly translucent and gemmy Mimetite crystals to 1.3cm showing pyramidal and pinacoidal terminations. This specimen is from the famed "Gem Pocket" at Tsumeb.

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Mimetite from Driggith mine, Caldbeck Fells, Cumbria, England

Mimetite
            from Driggith mine, Caldbeck Fells, Cumbria, England

Yellow, barrel-shaped or rice-shaped crystals to 3mm in a healthy dose across face. It's an older specimen, but I do not have an older label.

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Mimetite from Brown Monster mine, Inyo Co., California, United States

Mimetite
            from Brown Monster mine, Inyo Co., California, United States

Open fractures filled with yellow fibrous crystals to 2mm.

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Mimetite from Hilarion mine, Laurium dist., Attika, Greece

Mimetite
            from Hilarion mine, Laurium dist., Attika, Greece

Bright yellow tuft-like crystal clusters to 2mm on limonitic matrix with minor Anglesite.

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Mimetite from Johanngeorgenstadt, Erzgebirge, Saxony, Germany

Mimetite
            from Johanngeorgenstadt, Erzgebirge, Saxony, Germany

Yellow hexagonal crystals to 7mm on Quartz matrix. 

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Mimetite from Hat Yai dist., Songkhla, Thailand

Mimetite
            from Hat Yai dist., Songkhla, Thailand

Intense deep orange prismatic crystals of Mimetite to 4mm. 

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