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Hauerite.Colour: Reddish-brown/black.Type Locality: Kalinka, Vígľašská Huta - Kalinka, Detva Co., Banská Bystrica Region, Slovakia.

COBALTITE A single excellent well formed classic crystal of Cobaltite. The cubo-dodecahedral crystals of Cobaltite measures to nearly 1.4cm, having a bright metallic silver colour, set in the characteristic mixed Sulphide matrix. A true classic from Sweden

Pseudoboleite.Colour: Indigo blue, green-blue.Type Locality: Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur (BC Sur), Mexico.

Ullmannite. Masaloni Mine, San Vito, Cagliari Province, Sardinia, Italy Taille=4 mm Photo et collection Antonio Gamboni

Lorenzenite.Colour: Pale purple-brown, pale pink to mauve, brown to black.Hardness (Mohs): 6.Type Locality: Narssârssuk pegmatite (Narsarsuk pegmatite), Narssârssuk (Narsarsuk), Igaliku (Igaliko), Narsaq, Kitaa Province (West Greenland), Greenland.

Arsenopyrite. Bedford Consols Mine, Tavistock, Devon, UK Taille=12.5 x 5.5 x 5 cm Ex. collection Nick Carruth / Photo Crystal Classics

Babingtonite.Colour: Dark greenish-black . Hardness: 5½ - 6.Type Locality: Arendal Iron Mines, Arendal, Aust-Agder, Norway.

Gersdorffite, NiAsS, and Calcite, Aït Ahmane, Bou Azzer District, Tazenakht, Ouarzazate Province, Morocco. Main crystal size: 0.9 × 0.6 cm. Copyright © Fabre Minerals

Loparite-(Ce).COlor: Lead-grey,grey-black.Hardness: 5½.Type Locality: Maly Mannepakhk Mt (Malyi Mannepakhk Mt), Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.