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Caminite: Mg7(SO4)5(OH)4·(H2O)
Comments: White crystalline massive caminite. Location: Nepian Deposit, East Siberian Salt Basin, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Campigliaite: Cu4Mn(SO4)2(OH)6·4(H2O)
Comments: Sparse pale blue coatings of campigliaite on matrix. Location: Richfield, Sevier County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Canasite: (Na,K)6Ca5Si12O30(OH,F)4
Comments: Yellow translucent canasite grain with nepheline. Location: Kirovskii Mine, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Canavesite: Mg2(CO3)(HBO3)·5(H2O)
Comments: White acicular crystals of canavesite on matrix. Location: Brosso Mine, Ivrea, Piedmont, Italy. Scale: Picture size 9 mm. © Thomas Witzke / Abraxas-Verlag
Cancrinite: Na6Ca2Al6Si6O24(CO3)2
Comments: Milky white, translucent fan-shaped sprays of cancrinite crystals. Location: Point of Rocks Mesa, Colfax County, New Mexico, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Cancrisilite: Na7Al5Si7O24(C03)·3(H2O)
Comments: Light pink crystalline cancrisilite. Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Canfieldite: Ag8SnS6
Comments: Dull, black pseudo-octahedral crystals of canfieldite. Location: Gallofa vein, Colquechaca, Chayanta, Potosi, Bolivia. Scale: Crystal size 2 cm. © Dave Barthelmy
Cannizzarite: Pb4Bi6S13
Comments: Very delicate 2 mm. crystals of dark gray cannizzarite on matrix. Location: Kudryaviy Volcano, Iturup Island, Kurilian Island Chain, Russia. Scale: 3.8x3x2.4 cm. © Richard Dale / Dale Minerals
Cannonite: Bi2O(OH)2SO4 Bismuthinite: Bi2S3
Comments: Opaque white crystal tufts of cannonite on quartz crystals with dark, metallic bismuthinite. Location: Marysvale, Piute County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Caoxite: Ca(C2O4)·3(H2O)
Comments: Colorless to white crystals of caoxite on matrix. Location: Cerchiara Mine, Faggiona, Vara valley, La Spezia province, Liguria, Italy. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag