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Lopezite: K2Cr2O7
Comments: yellowish granular lopezite. Location: Tarapaca, Chile. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Lorandite: TlAsS2
Comments: Gemmy, transparent reddish brown crystals of lorandite on matrix. Location: Allchar, near Majdan, Macedonia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Lorandite: TlAsS2 Fangite: Tl3AsS4
Comments: Brown crystals of fangite with red lorandite. Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag
Lorenzenite: Na2Ti2Si2O9 Vuonnemite: Na11Nb2TiSi4O12(PO4)2O5F2
Comments: Square vuonnemite crystal with brown, lorenzenite crystals in syenite rock. Location: Ilimaussaq, Greenland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Lorenzenite: Na2Ti2Si2O9 Orthoclase: KAlSi3O8
Comments: Striated, dark violet crystal of lorenzenite in cream-colored orthoclase. Location: Khibiny Massif, Kola Peninsula, Russia. Scale: 1.3 x 1.2 cm. © John Veevaert
Lorettoite: Pb7O6Cl2
Comments: Orange crystalline lorettoite in matrix. Location: Kombat Mine, Kombat, Otjozondjuba, Namibia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Lotharmeyerite: CaZnMn+++(AsO3OH)4(OH)3
Comments: Brown, prismatic crystals lotharmeyerite on matrix. Location: Ojuela mine, Mapimi, Durango, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Loudounite: NaCa5Zr4Si16O40(OH)11·8(H2O)
Comments: SEM image of several spherulitic aggregates of loudounite with acicular actinolite. AmMin, 21:37. Location: Goose Creek quarry, Loudoun County, Virginia, USA. Scale: Scale Bar 50 µm. © American Mineralogist
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
Lourenswalsite: (K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12 Aegirine: NaFe+++Si2O6
Comments: Light brownish rosettes of lourenswalsite with dark green crystals of aegirine and white feldspar. Location: Diamond Jo quarry, Magnet Cove, Hot Springs Co., Arkansas, USA. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag