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Classic Old Rammelsbergite

The Mineral rammelsbergite




Rammelsbergite 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 Safflorite. Rammelsbergite was named after the German scientist K.F. Rammelsberg (1812-1899).
Chemical Formula NiAs2
Composition Nickel arsenide, sometimes with some cobalt and iron. If the nickel (Ni) is replaced by more than 50% iron (Fe), the mineral is not Rammelsbergite, but Loellingite, and if it is replaced by more than 50% cobalt (Co), the mineral is Safflorite.
Variable Formula (Ni,Fe,Co)As2
Color Silver-white with a reddish tint. Tarnishes yellow or pink.
Streak Gray
Hardness 5.5 - 6
Crystal System Orthorhombic
Crystal Forms
and Aggregates
Seldom occurs in crystals, which are tabular and short prismatic. Most commonly occurs massive, but also grainy, fibrous, and in coxcomb aggregates.
Transparency Opaque
Specific Gravity 6.9 - 7.1
Luster Metallic
Cleavage None
Fracture Uneven
Tenacity Brittle
In Group Sulfides; Arsenides
Striking Features Color and tarnish, crystal habits
Environment In medium temperature cobalt and nickel veins.
Rock Type Sedimentary, Metamorphic
Popularity (1-4) 4
Prevalence (1-3) 3
Demand (1-3) 3


Rammelsbergite ON EBAY




NOTEWORTHY LOCALITIES
Rammelsbergite is a rare mineral, and its localities are limited. Occurrences include Kongsberg, Norway; Ste Marie-aux-Mines, Alsace, France; Schneeberg, Saxony, Germany; Binntal, Switzerland; and Aït Ahmane, Bou Azzer, Morocco. Rammelsberg was found in Mexico in the Silver mines of Batopilas, Chihuahua. In Canada it occurs in the Eldorado mine near the Great Bear Lake, Northwestern Territories, and in Cobalt, Timiskaming District, Ontario. In the U.S., Rammelsbergite was found in the Mohawk mine, Keweenaw Co., Michigan; and in the Trotter Dump, Franklin, Sussex Co.,New Jersey.

COMMON MINERAL ASSOCIATIONS
Loellingite, Chloanthite, Silver

DISTINGUISHING SIMILAR MINERALS
Arsenopyrite - Difficult to distinguish, but contains sulfur attributes which are lacking in Rammelsbergite.
Skutterudite, Loellingite, and Safflorite - Indistinguishable without x-ray analysis.
Pyrite, Marcasite, and Pyrhottite - Occur in different crystals, more yellow in color.


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