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Metanovacekite: Mg(UO2)2(AsO4)2·4-8(H2O) Novacekite: Mg(UO2)2(AsO4)2·12(H2O)
Comments: Yellow, translucent platy novacekite/metanovacekite crystal aggregate. Location: Rabejac Mine, Olmet, Herault, France. 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
Metasideronatrite: Na2Fe+++(SO4)2(OH)·(H2O) Ungemachite: K3Na8Fe+++(SO4)6(NO3)2·6(H2O)
Comments: Translucent rounded ungemachite microcrystal on yellow metasideronatrite. Location: Chuquicamata, Antofagasta, Chile. 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
Metauranospinite: Ca(UO2)2(AsO4)2·8(H2O) Uranospinite: Ca(UO2)2(AsO4)2·10(H2O)
Comments: Translucent platy uranospinite (probably dehydrated to metauranospinite) microcrystals on matrix. Location: Grube Buhlskopf, near Ellweiler, Rheinland-Pfalz, Germany. 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
Mikasaite: Fe+++2(SO4)3
Comments: Pale yellow to white platy crystalline mikasaite cluster. Location: Ikushunbetsu, Mikassa, Hokkaido, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Minamiite: (Na,Ca,K)Al3(SO4)2(OH)6
Comments: White granular powdery minamiite aggregate. Location: Okumanza, Gumma, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Minasragrite: VO(SO4)·5(H2O) Patronite: VS4
Comments: Blue coatings of minasragrite on patronite. Location: Minas Ragra, near Cerro de Pasco, Junin, Peru. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Minehillite: (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 Margarosanite: Pb(Ca,Mn++)2Si3O9 Wollastonite-1A: CaSiO3
Comments: White pearly crystalline minehillite with white margarosanite and dark gray lead, in pale pink opaque wollastonite (distinguished by blue-white fluorescence). Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Minnesotaite: (Fe++,Mg)3Si4O10(OH)2
Comments: Greenish-gray dull minnesotaite masses in iron ore matrix. Location: Virginia, Saint Louis County, Minnesota, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Misenite: K8H8(SO4)7 (?)
Comments: Colorless absolutely transparent misenite microcrystal (blue box), on white and orange halite.. Location: Cerros Pintados, Pampa del Tamarugal, Iquique Province, Tarapacá Region, Chile. Scale: Approximately 0.05 cm crystal. © Jeff Weissman / Photographic Guide to Mineral Species
Moctezumite: Pb(UO2)(TeO3)2 Burckhardtite: Pb2(Fe+++,Mn+++)Te++++(AlSi3O10)O2(OH)2·(H2O)
Comments: Pink crusts of burckhardtite with yellow crystalline moctezumite on quartz. Location: Moctezuma Mine, Moctezuma, Sonora, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mohrite: (NH4)2Fe++(SO4)2·6(H2O)
Comments: Opaque botryoidal mohrite aggregate. Location: Saint Etienne, Layonnais, Languedoc, Loire, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Moluranite: H4U++++(UO2)3(MoO4)7·18(H2O)
Comments: Dark gray-black moluranite coatings on sandstone. Location: La Sal, San Juan County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Molybdite: MoO3
Comments: Greenish yellow molybdite crust on quartz. Location: Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species