's Image Gallery

Menezesite: Ba2MgZr4(BaNb12O42)·12H2O

Comments: Brownish-red rhombododecahedral crystals of menezesite over calcite (with tiny black tochilinite inclusions). AmMin v93:82.
Location: Jacupiranga mine, in Cajati county, São Paulo state, Brazil. Scale: Crystal size 0.5 mm.
© American Mineralogist

Menshikovite: Pd3Ni2As3  
Paolovite: Pd2Sn

Comments: BSE image showing menshikovite (mnv), paolovite (plv), isomertieite (ism), cobaltite (cob), and chalcopyrite (ccp) with quartz (qtz) and a Fe-rich aluminosilicate (sil).
Location: Lower (exo)-contact of the Chiney intrusion in Siberia. (CanMin, v40:679). Scale: See Image.
© Canadian Mineralogist

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

Mercury: Hg

Comments: Small silvery droplets of mercury on tan-colored rock matrix.
Location: Sonoma Co., California, USA. Scale: Picture size 5 cm.
© Kevin Ward

Mereheadite: Pb2O(OH)Cl

Comments: Yellowish crystals of mereheadite to 1mm embedded in matrix.
Location: Merehead quarry, Shepton Mallet, Somerset, England. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Merenskyite: (Pd,Pt)(Te,Bi)2  
Borovskite: Pd3SbTe4  
Temagamite: Pd3HgTe3

Comments: Borovskite (Bvk) - temagamite (Tmg) - merenskyite (Mrk) composite grain included in chalcopyrite (Ccp). (CanMin, v 42, p 674).
Location: McBratney high-grade PGE-Au occurrence, Bear Lake mafic unit, Proterozoic Flin Flon greenstone belt, Manitoba, Canada. Scale: See Image.
© Canadian Mineralogist

Meridianiite: MgSO4·11H2O

Comments: Red arrow points meridianiite on the underside of a post in a frozen pond. Ice, in the form of snow covers the top of the post and the frozen pond surface (AmMin, v92:1757). This in an analoge for probable Martian occurrences.
Location: The ponds are on the Basque claims, which occur in a small valley in the Thompson region of central British Columbia. Scale: See Image.
© American Mineralogist

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

Merrillite: Ca18Na2Mg2(PO4)14

Comments: BSE image of merrillite intergrown with silicates (plagioclase (plag), orthopyroxene(opx), olivine(ol)) next to coarse FeNi-metal (white).
Location: Portales Valley meteorite (1988). Scale: See Image.
© Alex Ruzicka / Planetary Science Research

Mertieite-II: Pd8(Sb,As)3

Comments: Oil immersion hotomicrograph of inclusions of mertieite-II in matrix of Pt-Fe alloy (CanMin, v 42, p 614).
Location: Kondyor PGE placer, Khabarovskiy Kray, eastern Siberia, Russia. Scale: See Image.
© Canadian Mineralogist

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

Mesolite: Na2Ca2Al6Si9O30·8(H2O)

Comments: Cotton-ball cluster of acicular white mesolite crystals on celestine.
Location: Cheyenne, Laramie County, Wyoming. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Messelite: Ca2(Fe++,Mn)(PO4)2·2(H2O)  
Leucophosphite: KFe+++2(PO4)2(OH)·2(H2O)

Comments: White messelite crystals with greenish leucophosphite.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Meta-autunite: Ca(UO2)2(PO4)2·2-6(H2O)

Comments: Platy meta-autunite crystals fluorescing greenish yellow.
Location: Carretona, Spain. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Meta-autunite: Ca(UO2)2(PO4)2·2-6(H2O)  
Autunite: Ca(UO2)2(PO4)2·10-12(H2O)

Comments: Corner of a meta-autunite crystal showing the dehydration of autunite (dark green) to meta-autunite (lighter yellowish green)..
Location: Daybreak Mine, Spokane County, Washington, U.S.A.. Scale: See Image.
© Paul M. Schumacher

Metacalciouranoite: (Ca,Na,Ba)U2O7·2(H2O)  
Calciouranoite: (Ca,Ba,Pb)U2O7·5(H2O)

Comments: Cryptocrystalline looking, greasy yellow blotches, of amorphous calciouranoite (probably, in part, dehydrated to matacalciouranoite).
Location: Oktyabr'skoye Mo-U deposit, east Transbaikal region, Russia. Scale: See Image.
© Rruff Database

Metacinnabar: HgS

Comments: Spherical metacinnabar crystals on quartz.
Location: Mt. Diablo mine, Contra Costa County, California, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Metadelrioite: CaSrV2O6(OH)2·(H2O)  
Delrioite: CaSrV2O6(OH)2·3(H2O)

Comments: Yellow metadelrioite and delrioite, with orange rossite/metarossite on a sandstone matrix. See inset image.
Location: Jo Dandy Mine, Montrose CO., USA. Scale: 6 1/4" x 5 1/2".
© Chris Wright / Wrights Rock Shop