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Anhydrite: CaSO4
Comments: Several terminated groups of light blue anhydrite crystals in parallel growth. Location: Naica. Chihuahua, Mexico. Scale: 9.5 x 8 x 6 cm. © Isaias Casanova / IC Minerals
Bixbyite: (Mn+++,Fe+++)2O3
Comments: Cubic crystals of bixbyite reaching 5 mm sit on a crude pseudomorph of hematite after garnet. Location: Thomas Range, Juab Co., Utah, USA. Scale: 1.5 x 1.6 cm. © Isaias Casanova / IC Minerals
Bournonite: PbCuSbS3
Comments: Lustrous, silvery crystals of bournonite on massive bournonite. Location: Mercedes Mine, Huanuco Dept., Peru. Scale: 3x3x2.7 cm. © Isaias Casanova / IC Minerals
Cafarsite: Ca8(Ti,Fe++,Fe+++,Mn)6-7(As+++O3)12·4(H2O)
Comments: Octahedron of cafarsite with a green coloration (?) on a gneiss matrix. Location: Vasl D' Aosta, Italy. Scale: 4.6x4.5x3.2 cm. © Isaias Casanova / IC Minerals
Enargite: Cu3AsS4
Comments: Lustrous, metallic gray columnar crystals of enargite with minor quartz. Location: Quiruvilca, La Libertad Dept., Peru. Scale: 4.2x2x2.3 cm. © Isaias Casanova / IC Minerals
Heklaite: KNaSiF6
Comments: Post mining sample of heklaite.. Location: Bone Valley Phosphate Mining District, near Bartow, Polk County, Florida. Scale: Specimen size 8.6 x 5.5 x 4.2 cm. © Isaias Casanova / IC Minerals
Heulandite-Ca: (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O)
Comments: Crystals of heulandite with a green color due to chlorite inclusions. Location: Malagaon, India. Scale: 5 x 4.5 x 3 cm. © Isaias Casanova / IC Minerals
Hyalophane: (K,Ba)Al(Si,Al)3O8
Comments: Twinned crystal of hyalophane slightly yellow from iron stains. Location: Sarajevo, Bosnia, Yugoslavia. Scale: 4 x 3 cm. © Isaias Casanova / IC Minerals
Jacobsite: (Mn++,Fe++,Mg)(Fe+++,Mn+++)2O4 Barite: BaSO4
Comments: Sharp, octahedral crystals of Jacobsite on a bladed barite matrix. Location: N' Chwaning II Mine, Kuruman, South Africa. Scale: 3x2.5x1.9 cm. © Isaias Casanova / IC Minerals
Kyanite: Al2SiO5 = Al[6]Al[6]OSiO4
Comments: Two terminated, bright blue crystals of kyanite in a white quartz matrix. Location: Barra do Salinas, Minas Gerais, Brazil. Scale: 9.5 x 4 x 4 cm. © Isaias Casanova / IC Minerals