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Heavy Mass of Safflorite

The Mineral safflorite

Safflorite belongs to the Loellingite group, which is a group of chemically related isomorphous minerals that are all rare. Other members discussed in this guide are Loellingite and Rammelsbergite. Safflorite oxidizes to form the pink cobalt mineral Erythrite. Safflorite may also form as a pseudomorph of Silver.
Chemical Formula CoAs2
The above is the formula of pure Safflorite. However, since it usually occurs with some iron replacing the zinc, its formula is more accurately described as (Co,Fe)As2.
Composition Cobalt arsenate, usually with iron, sometimes with some nickel. If the cobalt (Co) is replaced by more than 50% nickel (Ni), the mineral is not Safflorite, but Rammelsbergite, and if it is replaced by more than 50% iron (Fe), the mineral is Loellingite.
Variable Formula (Co,Fe)As2
Color Silver-white. Tarnishes dark gray.
Streak Black
Hardness 4.5 - 5.5
Crystal System Orthorhombic
Crystal Forms
and Aggregates
Occurs only in very small tabular crystals, which are usually twinned and compacted together. Also occurs massive, grainy, fibrous, dendritic, radial, and in coxcomb aggregates.
Transparency Opaque
Specific Gravity 7.0 - 7.3
Luster Metallic
Cleavage Indiscernible
Fracture Conchoidal
Tenacity Brittle
In Group Sulfides; Arsenides
Striking Features Color and tarnish, crystal habits, hardness
Environment Occurs in hydrothermal veins of moderate temperature and pressure, often in Silver deposits.
Rock Type Sedimentary, Metamorphic
Popularity (1-4) 4
Prevalence (1-3) 3
Demand (1-3) 3

Safflorite AUCTIONS

Safflorite is a rare mineral with few occurrences. It was found in Germany in Wittichen, Black Forest, Baden-Wurttemberg; and in Schlema-Hartenstein and Schneeberg, in the Erzgebirge, Saxony. It was also found in the Lill Mine, Pribram, Bohemia, Czech Republic; Bou Azzer, Morocco; the Castle and O'Brien Mines, Cobalt, Timiskaming District, Ontario, Canada; and the Olafsen Iron Mine, Hereford Township, Berks Co., Pennsylvania.

Arsenic, Erythrite, Calcite, Silver

Arsenopyrite - Greater hardness.
Skutterudite, Loellingite, and Rammelsbergite - Greater hardness.
Pyrite, Marcasite, and Pyrhottite - Occurs in different crystals, more yellow in color.

safflorite PHOTOS
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