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Lesukite Locality: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia Yellow crust of Lesukite. Field of view 5 mm. Specimen and photo Leon Hupperichs. Mineral

Lesukite

lesukite
Back-scatter electron images of polished sections with letnikovite-(Ce) [Lkv-Ce] in association with mendeleevite-(Ce) [Mdl-Ce], pectolite [Pct], fluorite [Fl] and quartz [Qz]: (a) the grain used for Raman spectroscopy, determination of micro-indentation hardness and reflectance spectra; (b) a microprobe mount with a grain that was deposited as holotype material (#98145) at the Fersman Mineralogical Museum. Mineral

Letnikovite-(Ce)

letnikovite-(Ce)

Formula
(Na◻)Ca2Ce2[Si7O17(OH)]F4(H2O)4
White crystals of the rare ammonium sulphate mineral letovicite from Anna Mine (Anna 2 Mine, Aachen, North Rhine - Westphalia, Germany). Letovicite is one of the few minerals that are a mixture between an organic (NH4) and an inorganic (SO4) mineral. Mineral

Letovicite

letovicite

Formula
(NH4)3H(SO4)2
leucite, quartz : Samchampi-Samteran alkaline igneous complex, Karbi Anglong District, Assam, India Mineral

Leucite

leucite

Formula
K(AlSi2O6)
Leucophanite, Aegirine Locality: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada The leucophanite is about 4-5 mm on edge. Via Jean-Pierre Beckerich. MOB coll. This is from a well known find that produced considerably larger gemmy xls - see Min Rec 7-8/1990 p. 320 Mineral

Leucophanite

leucophanite

Formula
NaCaBeSi2O6F
Leucophoenicite from the Wessels Mine in Kuruman, South Africa. Held in the A. E. Seaman Mineral Museum. Mineral

Leucophoenicite

leucophoenicite

Formula
Mn²⁺7(SiO4)3(OH)2
Hureaulite, Leucophosphite Locality: White Elephant Mine, Cicero Peak, Pringle, Custer District, Custer County, South Dakota, USA (Locality at mindat.org) Size: small cabinet, 9.8 x 5.4 x 3.4 cm Leucophosphite and Hureaulite Professor W.L. Roberts, the noted authority on phosphates of the amazingly rich and varied deposits in Custer County, sold this to John White at the Seattle Show in 1971. On the back of White's label, he notes that " Prof. Roberts says that this is one of the three best known specimens of Leucophosphite". The large, sharp brown crystals are robust and stereotypic for the species, and are not the typical micros. Whether that holds true still today, I am not sure. However, the image gallery on MINDAT shows that most examples are micros, or clusters of micros to 7mm. These sharp, euhedral, obvious and eye-visible crystals individually reach 3 mm or so. They sit perched in a very interesting matrix of finely reticulated hureaulite crystals which cross the protected cavity in this rock, in which the leucophosphite has grown. Ex. John White Collection. Mineral

Leucophosphite

leucophosphite

Formula
KFe³⁺2(PO4)2(OH)(H2O)2
Mohs
3.5
Leucosphenite from the famous Lovozero region in Russia. Mineral

Leucosphenite

leucosphenite

Formula
BaNa4Ti2B2Si10O30
Colorless prismatic crystals of the very rare Pb borate mineral leucostaurite from the TL (Asunción Mine, Caracoles, Sierra Gorda, Antofagasta Province, Antofagasta Region, Chile) and only one of three known localities worldwide. Ex. Erich Laskowski collection (USA). Mineral

Leucostaurite

leucostaurite

Formula
Pb2[B5O9]Cl·0.5H2O
:Locality: Har Parsa, Hatrurim Formation, Negev Desert, Israel Size: 1.5 × 1 × 0.3 cm Description: Polished preparation of this extremely rare species: levantite, from the Type Locality. It is a phosphate-silicate member of the latiumite group. Rim on latiumite-levantite crystals and a single crystal up to 0.03 micrometers. Accompanied by wollastonite, diopside-essenite, gehlenite, anothite, andradite-schorlomite, leucite, celsian, hematite, baryte and latiumite-levantite phase 50/50. The correct type locality is: Har Parsa (Mt. Parsa), Hatrurim Basin, Negev Desert, near Arad, Israel (31°12′ 29′′N, 35°16′45.6′′E). Approval Year: 2017 - IMA2017-010. SEM image Mineral

Levantite

levantite

Formula
KCa3Al2(SiO4)(Si2O7)(PO4)
Free standing crystals of the very rare new mineral leverettite (IMA 2013-11, a copper cobalt oxychloride) from the only known locality worldwide: Torrecillas Mine, Salar Grande, Iquique, Tarapacá Region, Chile. Mineral

Leverettite

leverettite

Formula
Cu3CoCl2(OH)6
Mineral

Levinsonite-(Y)

levinsonite-(Y)

Formula
YAl(SO4)2(C2O4)·12H2O
Mineral

Leybovite-K

leybovite-K

Formula
KCuNa(MgFe³⁺)(AsO4)3
Mineral

Leydetite

leydetite

Formula
Fe(UO2)(SO4)2·11H2O
Mineral

Leószilárdite

leószilárdite
Mineral

Lianbinite

lianbinite

Formula
(NH4)(C2H3O3)(C2H4O3)
Yellow crystal aggregates of the very rare uranium-niobium-tantalum mineral liandratite associated to black columbite-(Mn). From Mica Lode Mine, Eight Mile Park Pegmatite, Fremont County, Colorado, United States of America. Ex. Erich Laskowski collection Mineral

Liandratite

liandratite

Formula
U(Nb,Ta)2O8
Mohs
3.5
Mineral

Liangjunite

liangjunite

Formula
K2(Mo2O5)(SO4)2·3H2O
Mineral

Libbyite

libbyite

Formula
(NH4)2(Na2◻)[(UO2)2(SO4)3(H2O)]2·7H2O
Brown crystal aggregates of the very rare Li-Be silicate mineral liberite from the type locality in China (Xianghualing Mine, Linwu County, Chenzhou, Hunan Province, China), and associated to white hsianghualite. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium Mineral

Liberite

liberite

Formula
Li2BeSiO4
Mohs
7
Libethenite Locality: Ľubietová (Libetbánya; Libethen) ore belt, Western Slovenské Rudohorie Mts, Banská Bystrica Region, Slovakia (Locality at mindat.org) Size: 8.7 x 5.5 x 5.3 cm. This classic Slovakian Libethenite is loaded with sparking green, vitreous, orthorhombic crystals on matrix. Libethenite typically forms from weathered Apatite crystals, and is one of the most distinctive and beautiful colors for a mineral species. These specimens are not terribly common on the market today, and good Libethenites from the type locality are always in high demand. This piece comes from the Richard A. Kosnar Collection and the hand-painted label on the reverse side of the specimen states that it was collected in 1823. Mineral

Libethenite

libethenite

Formula
Cu2PO4(OH)
Mohs
4
crystals of tourmaline var. liddicoatite, crystals of quartz, crystals of feldspar : Anjanabonoina pegmatites, Ambohimanambola Commune, Betafo District, Vakinankaratra Region, Antananarivo Province, Madagascar Mineral

Liddicoatite

liddicoatite
Mineral

Liebauite

liebauite

Formula
Ca3Cu5Si9O26
Green liebenbergite crystals associated to a whitlockite group mineral from Lavrion (Kamariza Mines, Lavrion, Attiki Prefecture, Greece). Liebenbergite has only been found in 4 localities worldwide. Mineral

Liebenbergite

liebenbergite

Formula
Ni2SiO4