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Mcnearite: NaCa5H4(AsO4)5·4(H2O)
Comments: Crystalline mcnearite micro botryoids on matrix. Location: Gabbe Gottes, Sainte-Marie-aux-Mines, Haute-Rhin, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Medaite: (Mn,Ca)6(V+++++,As)Si5O18(OH)
Comments: Orange crystalline medaite crust. Location: Molinello Mine, near Chiavari, Liguria, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Meionite: Ca4Al6Si6O24CO3 Kaliophilite: KAlSiO4
Comments: Tan to white fibrous kaliophilite crystal bundle with white translucent meionite on matrix. Location: Mont Somma, Naples, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Melanotekite: Pb2Fe+++2Si2O9
Comments: Black metallic granular melanotekite with reddish brown andradite. Location: Langban, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Melanothallite: Cu2OCl2 Chloromenite: Cu9O2(SeO3)4Cl6
Comments: Olive green crystalline chloromenite on blue-green melanothallite. Location: North Break, Second Cone of main fracture eruption, Tolbachik Volcano, Kamchatka District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Melanothallite: Cu2OCl2
Comments: Bluish green melanothallite grain. Location: North Break, Second Cone, Main Eruption Site, Tolbachik, Kamchatka District, Russian Far East, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Melanovanadite: CaV++++2V+++++2O10·5(H2O)
Comments: Dark greenish-black fine-grained massive melanovanadite. Location: Minas Ragra, near Cerro de Pasco, Junin, Peru. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Melonite: NiTe2
Comments: Metallic foil of melonite. Location: Cresson Mine, Cripple Creek, Teller County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mendipite: Pb3Cl2O2 Crednerite: CuMnO2
Comments: Sooty, deep-black, granular to platy crednerite with mendipite. Location: Mendip Hills, Somerset, England. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mendipite: Pb3Cl2O2 Chloroxiphite: Pb3CuCl2(OH)2O2 Crednerite: CuMnO2
Comments: Green, opaque granular chloroxiphite with mendipite and black crednerite. Location: Higher Pitts Farm, Priddy, Mendip Hills, Somerset, England. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mendipite: Pb3Cl2O2 Crednerite: CuMnO2 Chloroxiphite: Pb3CuCl2(OH)2O2
Comments: Radiating compact with clear to white crystalline mendipite with black crednerite and green chloroxiphite. Location: Mendip Hills, Somerset, England. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mendozite: NaAl(SO4)2·11(H2O)
Comments: White chalky massive mendozite. Location: Gold Bottom Mine, Inyo County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mercallite: KHSO4
Comments: Pale blue to white powdery aggregate of mercallite. Location: Vesuvius, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mercury: Hg
Comments: Silvery metallic mercury coatings on quartz. Location: Socrates Mine, Sonoma County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Merlinoite: (K,Ca,Na,Ba)7Si23Al9O64·23(H2O)
Comments: Colorless transparent prismatic merlinoite microcrystals in vug. Location: Lagno Ahendo Lare, Vesuvius, Naples, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Merrihueite: (K,Na)2(Fe++,Mg)5Si12O30 Chayesite: K(Mg,Fe++)4Fe+++(Si12O30)
Comments: A sharp, chemically zoned crystal of copper-brown merrihueite(?) (see Lapis-Magazine 4/2002 Page 38/39) overgrown on bluish chayesite. Location: Basalt quarry, Pauliberg Mt., Kobersdorf, Oberpullendorf, Burgenland, Austria. Scale: Crystal Size 0.15 cm. © Jeff Weissman / Photographic Guide to Mineral Species
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) Hohmannite: Fe+++2(SO4)2(OH)2·7(H2O)
Comments: Orange opaque prismatic microcrystals of hohmannite mixed with yellow metahohmanite. Location: Chuquicamata, Antofagasta, Chile. 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