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Merwinite: Ca3Mg(SiO4)2
Comments: Dark brown crystalline merwinite in light green crystalline massive marble. Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Metahaiweeite: Ca(UO2)2Si6O15·n(H2O), n<5 Haiweeite: Ca[(UO2)2Si5O12(OH)2]·3(H2O)
Comments: Pale yellow scaly metahaiweeite coating on quartz with minute haiweeite acicular crystals. Location: Coso Uranium Mine, Inyo County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Metahohmannite: Fe+++2[O(SO4)2]·4(H2O)
Comments: Orange-yellow earthy massive metahohmannite with orange hohmannite. Location: Quetena, Antofagasta, Chile. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Metanovacekite: Mg(UO2)2(AsO4)2·4-8(H2O)
Comments: Bright yellow crystalline metanovacekite coatings on white crystalline gypsum. Location: Las Animas Mine, Municipio do Heuiles Serdan, Chihuahua, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Metaschoderite: Al2(PO4)(VO4)·6(H2O)
Comments: Orange crystalline metaschoderite crust on shale. Location: 25 miles east of Eureka, Fish Creek Range, Eureka County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Metastibnite: Sb2S3 Sulfur: S8
Comments: Red coatings of metastibnite with yellow sulfur. Location: Steamboat Springs, Washoe County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Metastudtite: UO4·2(H2O)
Comments: White acicular microcrystal metastudtite clusters on dark yellow to brown sklodowskite grains. Location: Musonoi, Katanga, Shaba, Zaire. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Metazellerite: Ca(UO2)(CO3)2·3(H2O) Voglite: Ca2Cu(UO2)(CO3)4·6(H2O)
Comments: Pale yellow crystalline metazellerite in matrix, with green voglite. Location: White Canyon #1 Mine, Frey Point, San Juan County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Microcline: KAlSi3O8
Comments: Opaque blocky tan crystal of microcline. Location: Moat Mountain, near Conway, Carroll County, New Hampshire, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Microsommite: (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3
Comments: Colorless prismatic microsommite microcrystals in vug. Location: Novella Quarry, Vesuvius, Naples, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species