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Loellingite with Siderite
SULFIDES; ARSENIDES · ORTHORHOMBIC

Loellingite

FeAs2

Hardness
5–5.5
Streak
Dark gray
Spec. Gravity
7.1–7.6
System
Orthorhombic

About

Loellingite, also known as Löllingite, is named after the Austrian type locality it was first described in, which is Loelling (or Lölling), Carinthia, Austria. Since the English language lacks the letter O with an umlaut, this guide uses the alternate spelling of Loellingite.
Loellingite belongs to the Loellingite group, which is a group of chemically related isomorphous minerals that are all uncommon. Other members discussed in this guide are Rammelsbergite and Safflorite.

Crystal Forms & Aggregates

Other ID Marks

Gives off a garlic odor when struck or heated. (Fumes are toxic.)

Complex Tests

Striking Features

Crystal habits, gives off garlic odor when struck

Environment

Varieties

✓ common  · ✗ uncommon

Uses

Loellingite is found together with other arsenic minerals, and is thus a minor ore of arsenic.

Noteworthy Localities

Loellingite is not a common mineral, and has been found in the following European localities: the Wolfbau Mine, Loelling, Carinthia, Austria; Carles, Asturias, Spain; the Ste Marie-aux-Mines, Alsace, France; and Dolni Bory, Moravia, Czech Republic.
Loellingite was found in Australia in Broken Hill, New South Wales, in highly lustrous crystals. A recent find of Loellingite, in exceptionally large crystals, is the Huanggang Mine, Inner Mongolia, China.

In the U.S., Loellingite was found in Franklin and Ogdensburg, Sussex Co., New Jersey; Amity and Warwick, Orange Co., New York; Center Strafford, Strafford Co., New Hampshire; near Auburn, Androscoggin Co., Maine; and Mt Mica, Paris, Oxford Co., Maine. In Canada, it was found in the Cobalt area, Timiskaming District, Ontario.

Common Mineral Associations

Distinguishing Similar Minerals

Photos

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Crystal forms

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Elongated Prismatic
Tabular