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Afghanite: (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3·(H2O)
Comments: Parallel grouping of three, terminated, blue, opaque afghanite crystals set in matrix. Location: Sar-eSang, Badakhshan, Afghanistan. Scale: Crystal size 3 cm. © Dan Weinrich
Alamosite: PbSiO3
Comments: White alamosite crystal group. John Schneider Collection. Location: Tsumeb, Namibia. Scale: 3.5x3x2 cm. © Dan Weinrich
Albite: NaAlSi3O8 Plagioclase: (Na,Ca)(Si,Al)4O8
Comments: Colorless, lustrous blocky albite crystals to 3 cm in size with a thick dusting of micaceous green micro chlorite. Location: Acushnet Quarry, Bristol Co., Massachussetts, USA. Scale: 17 x 15 x 7.5 cm matrix. © Dan Weinrich
Apatite: Ca5(PO4)3(OH,F,Cl) Apatite-(CaF): Ca5(PO4)3F Beryl: Be3Al2Si6O18 Muscovite: KAl2(Si3Al)O10(OH,F)2
Comments: Pink crystals of fluorapatite with pale blue beryl (aquamarine) on books of muscovite crystals. Location: Nagar area, Gilgit district, Northern Areas, Pakistan. Scale: 3 x 3 cm. © Dan Weinrich
Apatite-(CaF): Ca5(PO4)3F Beryl: Be3Al2Si6O18 Muscovite: KAl2(Si3Al)O10(OH,F)2 Apatite: Ca5(PO4)3(OH,F,Cl)
Aurichalcite: (Zn,Cu)5(CO3)2(OH)6
Comments: Sky-blue radiating acicular crystals of aurichalcite covering matrix. Location: Lucin, Utah, USA. Scale: 6.5 x 3 x 2 cm with 5 mm crystals. © Dan Weinrich
Bertrandite: Be4Si2O7(OH)2
Comments: Colorless prismatic crystals of bertrandite on matrix with pale pink rhombohedral crystals of rhodochrosite. Location: Yiaoguanshen mine, Hunan Province, China. Scale: 3.5 x 4 cm. © Dan Weinrich
Beryl: Be3Al2Si6O18
Comments: Transparent Aquamarine, the blue variety of beryl. Location: Nagar, Pakistan. Scale: 3 x 4 x 8.5 cm. © Dan Weinrich
Beryl: Be3Al2Si6O18 Apatite-(CaF): Ca5(PO4)3F Muscovite: KAl2(Si3Al)O10(OH,F)2 Apatite: Ca5(PO4)3(OH,F,Cl)
Cavansite: Ca(VO)Si4O10·4(H2O)
Comments: Brilliant blue balls of acicular crystals of cavansite to 1 cm in size richly scattered about a matrix of colorless stilbite crystals. Location: Wagholi, Poona district, Maharashtra, India. Scale: 7.5 x 9 x 8 cm. © Dan Weinrich
Celestine: SrSO4
Comments: Transparent blue orthorhombic crystals of celestine, some doubly terminated to 15 mm in size, on a limestone matrix. Location: Clay Center, Ohio, USA. Scale: 5 x 9 x 2.5 cm. © Dan Weinrich
Cerussite: PbCO3 Mimetite: Pb5(AsO4)3Cl
Comments: Creamy white crystal of cerussite measuring 11 x 22 mm in size nestled nicely in a vug which is lined by bright-yellow, lustrous, prismatic mimetite crystals. The mimetites average 5 mm in length. Location: Tsumeb mine, Tsumeb, Namibia. Scale: 3.5 x 4.5 x 2.5 cm. © Dan Weinrich
Chrysocolla: (Cu,Al)2H2Si2O5(OH)4·n(H2O) Tenorite: CuO
Comments: Lustrous black botryoidal Tenorite mostly covering a sky-blue massive chrysocolla matrix. Location: 79 mine, Banner district, Pinal Co., Arizona. Scale: 5.5 x 3 cm. © Dan Weinrich
Copper: Cu
Comments: Native copper forming a branching cluster of crystals with some massive calcite. Location: Houghton County, Michigan, USA. Scale: Crystal size 1.5 cm. © Dan Weinrich
Creedite: Ca3Al2(SO4)(F,OH)10·2(H2O) Smithsonite: ZnCO3
Comments: Purple transparent crystals of creedite to 6 mm on matrix of creamy botryoidal crystalline smithsonite. Location: Level 8 San Antonio mine, Santa Eulalia, Chihuahua, Mexico. Scale: 7 x 3.5 x 2 cm. © Dan Weinrich
Cuprite: Cu2O
Comments: Dark red ball or sphere of cuprite crystals set on a pearly white dolomite crystal matrix. Location: Tsumeb mine, Tsumeb, Namibia. Scale: 5 x 2.5 x 4 cm. © Dan Weinrich
Danburite: CaB2(SiO4)2
Comments: Very-fine, large, single transparent crystal of danburite with minor crystals of colorless calcite all around the base. Location: Charcas, San Luis Potosi, Mexico. Scale: 4 x 2.5 x 9.5 cm. © Dan Weinrich
Dioptase: CuSiO2(OH)2
Comments: Emerald green lustrous crystals of dioptase to 14 mm in size and doubly terminated, set upon a limestone and massive calcite matrix. Location: Altyn-Tyube, South Kazakhstan Oblast', Kazakhstan. Scale: 3.5 x 4.5 x 2 cm. © Dan Weinrich
Dyscrasite: Ag3Sb
Comments: Metallic-silver, prismatic, crystallized dyscrasite. Individual crystal spears to 8 mm in size. Location: Mine #21, Pribram, Bohemia, Czech Republic. Scale: 6 x 10 x 6.5 cm. © Dan Weinrich
Enstatite: Mg2Si2O6
Comments: Single, terminated, brown, transparent to translucent enstatite crystal. Location: Mpwa-Mpwa, Tanzania. Scale: 17x17x27 mm. © Dan Weinrich