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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
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