Mineral Specimen Images (M)

Malayaite: CaSnSiO5 = CaSnOSiO4

Comments: Pale bluish colored malayaite under visible and SWUV light.
Location: Red-a-Ven Mine, Meldon, Okehampton, Devon, Great Britain. Scale: 3.7 x 2 cm.
© John Veevaert

Maldonite: Au2Bi

Comments: PPL polished section showing maldonite grain associated with native bismuth (Bi) and exsolved bismuth-gold areas..
Location: Escanaba Trough at the southern end of the Gorda Ridge. (Geology, v36:815). Scale: See Image.
© Geology

Maleevite: BaB2Si2O8

Comments: Backscatter elecron images of (a) an intergrowth of maleevite (Mal) and quartz (Qtz) and unknown Y-silicate (Y-Si); (b) maleevite (Mal) in arfvedsonite and astrophyllite (Astr) (CanMin, v 42, p 109).
Location: Moraine of the Dara-i-Pioz glacier, Alai range, Tien Shan, northern Tajikistan. Scale: See Image.
© Canadian Mineralogist

Malhmoodite: FeZr(PO4)2·4(H2O)

Comments: Small white aggregate of malhmoodite on matrix.
Location: Union Carbide Mine, Wilson Springs (Potash Sulfur Springs), Garland Co., Arkansas, USA. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Malinkoite: NaBSiO4

Comments: White to clear glassy mico crystals of malinkoite to less than 0.75mm deep in a vug.
Location: Mont St. Hilaire, Rouville Co., Quebec, Canada. Scale: 2 x 1.5 x 1.5 cm.
© Tom Loomis / Dakota Matrix

Malladrite: Na2SiF6  
Avogadrite: (K,Cs)BF4

Comments: Botryoidal pinkish-white avogadrite with yellow malladrite.
Location: Eruption of 1926, Vesuvius, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Malladrite: Na2SiF6  
Avogadrite: (K,Cs)BF4

Comments: Yellow-orange crystalline malladrite with pinkish white avogadrite.
Location: Eruption of 1926, Vesuvius, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mallestigite: Pb3Sb+++++(SO4)(AsO4)(OH)6·3(H2O)

Comments: Colorless prismatic crystals of mallestigite.
Location: Mallestiger Mittagskogel, Finkenstein, Villach, Carinthia, Austria. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Mammothite: Pb6Cu4AlSb+++++O2(SO4)2Cl4(OH)16

Comments: Sparse blue crystalline mammothite in slag.
Location: Laurium, Attiki, Greece. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Manaksite: KNaMn++Si4O10  
Bario-olgite: Na(Ba,Sr,Na,REE)PO4

Comments: Pale brown massive manaksite associated with grayish-green bario-olgite, purple ussingite and colorless serandite.
Location: Palitra pegmatite, Kedykverpakhk Mountain, Lovozero massif, Kola Peninsula, Russia. Scale: See Image.
© Rruff Database

Manandonite: Li2Al4[(Si2AlB)O10](OH)8

Comments: Massive manandonite with crystals to 2 mm.
Location: Manandona River, Sahatany Valley, Madagascar. Scale: 2.2 x 1.3 cm.
© John Veevaert

Manasseite: Mg6Al2(CO3)(OH)16·4(H2O)

Comments: Brownish yellow crystal of manasseite on dolomite matrix.
Location: Jacupiranga mine, Jacupiranga, Sao Paolo, Brazil. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Mandarinoite: Fe+++2Se3O9·6(H2O)

Comments: Specimen of solid manandonite with crystals to 2 mm.
Location: Manandona River, Sahatany Valley, Madagascar. Scale: 2.2 x 1.3 cm.
© John Veevaert

Manganbabingtonite: Ca2(Mn,Fe++)Fe+++Si5O14(OH)

Comments: Brownish black manganbabingtonite associated with pink Inesite blades.
Location: Hubei, China. Scale: 8 x 5.7 cm.
© Fabre Minerals

Manganbelyankinite: (Mn,Ca)(Ti,Nb)5O12·9(H2O)

Comments: Brownish to blackish manganbelyankinite coatings on syenite rock.
Location: Punkurvaiv, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Manganberzeliite: (Ca,Na)3(Mn,Mg)2(AsO4)3

Comments: Orange translucent crystalline manganberzeliite in clear calcite.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mangangordonite: (Mn++,Fe++,Mg)Al2(PO4)2(OH)2·8(H2O)

Comments: White, blocky crystal of mangangordonite to 0.5mm on matrix.
Location: Foote mine, Cleveland Co., North Carolina, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Manganiandrosite-(La): (Mn,Ca)(La,Ce,Ca,Nd)AlMn+++Mn++(SiO4)(Si2O7)O(OH)

Comments: Orange glassy crystalline manganiandrosite-(La).
Location: Mt. Petalon, Andros Island, Cyclades, Greece. Scale: Thumbnail.
© Tom Loomis / Dakota Matrix

Manganilvaite: CaFe++Fe+++(Mn,Fe++)(Si2O7)O(OH)

Comments: Small, black, very bright crystals of manganilvaite on a matrix of clear quartz, white calcite, and tiny brassy pyrite crystals.
Location: Daye mining area, Hubei, China. Scale: 6 x 5.6 x 3.7 cm.
© Fabre Minerals

Manganipiemontite-(Sr): CaSr(Mn+++,Fe+++)2Al[Si3O12](OH)

Comments: Thin-section of (100) twinned tweddillite blades (red-orange-magenta ) in a matrix of serandite-pectolite (white-grey-yellow). Crossed polarizers. (MinMag 66:144).
Location: Kalahari manganese fields (Republic of South Africa). Scale: Picture Size 1 mm.
© Mineralogical Magazine