Mineral Specimen Images (M)

Mendipite: Pb3Cl2O2  
Chloroxiphite: Pb3CuCl2(OH)2O2  
Crednerite: CuMnO2

Comments: Green, opaque granular chloroxiphite with mendipite and black crednerite.
Location: Higher Pitts Farm, Priddy, Mendip Hills, Somerset, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mendipite: Pb3Cl2O2  
Crednerite: CuMnO2  
Chloroxiphite: Pb3CuCl2(OH)2O2

Comments: Radiating compact with clear to white crystalline mendipite with black crednerite and green chloroxiphite.
Location: Mendip Hills, Somerset, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mendozavilite: (Na,Mg)Ca2[Mo++++++8P+++++2Fe+++3O36(OH)]·n(H2O), n~9

Comments: Vuggy matrix covered with yellow micro crystals of mendozavilite.
Location: Rustler mine, Tooele County, Utah, USA. Scale: Specimen size 1 cm.
© John Veevaert

Mendozavilite: (Na,Mg)Ca2[Mo++++++8P+++++2Fe+++3O36(OH)]·n(H2O), n~9

Comments: Light yellow micro crystals of mendozavilite and earthy alterations in vuggy quartz matrix with black schorl.
Location: Rustler mine, Tooele Co., Utah, USA. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Mendozite: NaAl(SO4)2·11(H2O)

Comments: White chalky massive mendozite.
Location: Gold Bottom Mine, Inyo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Meneghinite: Pb13CuSb7S24

Comments: Black, acicular crystals of meneghinite on matrix.
Location: Bottino Mine, Tuscany, Italy. Scale: 1x1 cm.
© Dave Barthelmy

Menezesite: Ba2MgZr4(BaNb12O42)·12H2O

Comments: Orange rhombododecahedral crystals of menezesite to 0.75mm on matrix.
Location: Jacupiranga mine, Cajati county, Sao Paulo, Brazil. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

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