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Lorettoite: Pb7O6Cl2
Comments: Orange crystalline lorettoite in matrix. Location: Kombat Mine, Kombat, Otjozondjuba, Namibia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Loughlinite: Na2Mg3Si6O16·8(H2O) Bradleyite: Na3Mg(PO4)(CO3)
Comments: Silky fibrous veinlets of loughlinite with bradleyite. Location: Green River area, Sweetwater County, Wyoming, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Lovdarite: K2Na6Be4Si14O36·9(H2O)
Comments: Bright white crystal sprays of lovdarite on fine-grained white natrolite. Location: Yubileinaya Pegmatite, Mount Karnasurt, Lovozero Massif, Kola Peninsula, Murmansk, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Lovozerite: H4Na2Ca(Zr,Ti)[Si6O18]
Comments: Pinkish lovozerite with red crystalline eudialyte. Location: Mount Rasvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Loweite: Na12Mg7(SO4)13·15(H2O)
Comments: Opaque white crystalline löweite with clear colorless halite. Location: Wilhelmshall, near Stassfurt, Sachsen-Anhalt, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Luanheite: Ag3Hg
Comments: Inclusions of luanheite, in tellurium, in quartz. Location: Mina Bambolla, Moctezuma, Sonora, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ludjibaite: Cu5(PO4)2(OH)4
Comments: Coating of intense blue-green microcrystals and crystalline ludjibaite. Location: Shituru, Shaba, Zaire. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ludwigite: Mg2Fe+++BO5 Chestermanite: Mg2(Fe+++,Mg,Al,Sb+++++)BO3O2
Comments: Black capillary crystals of ludwigite with green inclusions of chestermanite in impure marble. Location: Near Potter Pass, Fresno County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Luetheite: Cu2Al2(AsO4)2(OH)4·(H2O)
Comments: Blue to greenish crystalline luetheite crust on altering rock matrix. Location: Patagonia, Santa Cruz County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Luzonite: Cu3AsS4
Comments: Pinkish-brown metallic luzonite, tarnishing gray, crystalline. Location: Chin Kuashih, Kagoshima, Taiwan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Macdonaldite: BaCa4[Si16O36(OH)2]·10(H2O)
Comments: Bright white flattened radial macdonaldite aggregate on quartz. Location: Rush Creek, Fresno County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mackinawite: (Fe,Ni)S0.9
Comments: Mackinawite inclusions in sulfide ore (polished specimen). Location: Mackinaw Mine, Snohomish County, Washington, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Madocite: Pb17(Sb,As)16S41
Comments: Gray metallic massive madocite fragment. Location: Madoc, Ontario, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Magadiite: NaSi7O13(OH)3·4(H2O) Rhodesite: KHCa2Si8O19·5(H2O)
Comments: Earth pale tan massive magadiite with dark yellow crystalline rhodesite. Location: East Fork, Trinity River, Trinity County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Maghemite: gamma-Fe+++2O3
Comments: Fine-grained massive maghemite intermixed with hematite. Location: Gara Djebilet, Algeria. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Magnesioaubertite: (Mg,Cu)Al(SO4)2Cl·14(H2O) Pickeringite: MgAl2(SO4)4·22(H2O)
Comments: Aqua crystalline magnesioaubertite with white pickeringite. Location: Grotto di Faraglione, Vulcano, Sicily, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Magnesiochromite: MgCr2O4
Comments: Black crystalline magnesiochromite grains in serpentinite. Location: Red Pit, Fulton Township, Lancaster County, Pennsylvania, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Magnesioclinoholmquistite: Li2(Mg,Fe++)3Al2Si8O22(OH)2 Clinoholmquistite: [ ](Li2Mg3Al2)Si8O22(OH)2 Fluoro-sodic-pedrizite: NaLi2(Mg2Al2Li)?5Si8O22F2
Comments: Dark blue fibrous clinoholmquistite with radiating structure, variety magnesioclinoholmquistite. Clinoholmsquitite may be a new aphibole, fluoro-sodic-pedrizite.. Location: Near Murun, Republic of Sakha, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Magnesiocopiapite: MgFe+++4(SO4)6(OH)2·20(H2O) Guildite: CuFe+++(SO4)2(OH)·4(H2O)
Comments: Brown granular guildite with greenish yellow magnesiocopiapite. Location: United Verde Mine, Jerome, Yavapai County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Magnesiocopiapite: MgFe+++4(SO4)6(OH)2·20(H2O)
Comments: Pale yellow opaque aggregate of magnesiocopiapite. Location: Denver Mine, Santa Cruz County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species