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Mineralpedia Details for Erythrite

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Erythrite

Erythrite

Named for the Greek word for “red,” erythros, in reference to the minerals common crimson color. Purple to reddish purple, crimson, pale rose, or pink, elongated tabular or knife-like crystals in the millimeter range to free-standing thick, tabular crystals to 1cm or more. Also in radial groups or stellate aggregates, can be fibrous, pulverulent, massive. Large crystals are rare and are easily seperated with a knife and are sectile showing a perfect cleavage. Occurs as a secondary mineral in the oxide zone of some Co–Ni–As-bearing mineral deposits such as Cobalt, Canada or Bou Azzer, Morocco. Common mineral with many other localities.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/erythrite.pdf

Formula
Co3(AsO4)2·8H2
Crystal System
Monoclinic 
Crystal Habit
Striated, Prismatic, Divergent 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
colorless, violet red, light pink, purple red 
Streak
pinkish red 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
1.5-2 
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Erythrite from Bou Azzer dist., Anti-Atlas, Morocco

Erythrite
            from Bou Azzer dist., Anti-Atlas, Morocco

Platy or thick tabular magenta purple crystals to 8mm with acicular purple crystals lining the vug. 

Erythrite from Schneeberg dist., Erzgebirge, Saxony, Germany

Erythrite
            from Schneeberg dist., Erzgebirge, Saxony, Germany

An 8mm purple divergent spray with several others along a Quartz seam in matrix.

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Erythrite from Carcoare, New South Wales, Australia

Erythrite
            from Carcoare, New South Wales, Australia Magenta or purple radial sprays to 6mm.
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Erythrite from Cobalt-Gowganda dist., Ontario, Canada

Erythrite
            from Cobalt-Gowganda dist., Ontario, Canada

Pink crust on skutterudite.

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Erythrite from Sara Alicia mine, San Bernardo, Sonora, Mexico

Erythrite
            from Sara Alicia mine, San Bernardo, Sonora, Mexico

Good coverage of fine bladed, magenta-pink Erythrite in sprays and clusters to 4mm covering matrix.

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Erythrite from Blackbird dist., Lemhi Co., Idaho, United States

Erythrite
            from Blackbird dist., Lemhi Co., Idaho, United States

"Cobalt Bloom" is an an old term for Erythrite. Erythrite is derived from the Greek word for "red' eluding to its deep crimson color. This specimen has nice micro Erythrite in sprays and bundles on probably cobaltoan Mansfieldite.

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Erythrite from Jachymov, Erzgegirge, Bohemia, Czech Republic

Erythrite
            from Jachymov, Erzgegirge, Bohemia, Czech Republic

An antique specimen with red spherulitic crystal groups and sulfides in matrix. It's actually nice observed under the scope. Noitice the old name for Erythrite on the labels "cobaltbluthe" or cobalt bloom. It may have components of Babanekite, the new copper analogue of Erythrite from this locality, which looks exactly like erythrite. The EDS however showed no copper, although there are areas which show blue alterations so I am wondering if it needs additional work.

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Erythrite from Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States

Erythrite
            from Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States

Tiny reddish pink acicular radial groups of Erythrite.

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Erythrite from French Creek mines, Chester Co., Pennslyvania, United States

Erythrite
            from French Creek mines, Chester Co., Pennslyvania, United States

Purplish red coatings of Erythrite with octahedral Pyrite crystals from 1.5 to 5mm in Calcite.

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