Mineral Specimen Images (M)

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

Metahaiweeite: Ca(UO2)2Si6O15·n(H2O), n<5  
Haiweeite: Ca[(UO2)2Si5O12(OH)2]·3(H2O)

Comments: Pale yellow scaly metahaiweeite coating on quartz with minute haiweeite acicular crystals.
Location: Coso Uranium Mine, Inyo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metaheinrichite: Ba(UO2)2(AsO4)2·8(H2O)

Comments: Siliceous jasperoid with a black crust of uraninite (?) and bright canary yellow crystals of metaheinrichite crystals to 2.5mm across.
Location: White King Mine, Lakeview, Oregon, USA. Scale: Picture size 2 cm.
© John Veevaert

Metaheinrichite: Ba(UO2)2(AsO4)2·8(H2O)

Comments: Very pale greenish crystals of metaheinrichite on matrix.
Location: Schmiedestollenhalde mine, Wittichen, Schenkenzell, Schwartzwald (Black Forest), Baden-Württemberg, Germany. Scale: Picture size 0.5 cm.
© Paul M. Schumacher

Metahewettite: CaV6O16·3(H2O)

Comments: Deep red, vibrant, radial micro crystals of metahewettite to 3mm in diameter on matrix.
Location: Cactus Rat mine, Grand County, Utah. Scale: 4 x 4 x 2 cm.
© John Veevaert

Metahohmannite: Fe+++2[O(SO4)2]·4(H2O)  
Hohmannite: Fe+++2(SO4)2(OH)2·7(H2O)

Comments: Orange opaque prismatic microcrystals of hohmannite mixed with yellow metahohmanite.
Location: Chuquicamata, Antofagasta, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metahohmannite: Fe+++2[O(SO4)2]·4(H2O)

Comments: Orange-yellow earthy massive metahohmannite with orange hohmannite.
Location: Quetena, Antofagasta, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metakottigite: (Zn,Fe+++,Fe++)3(AsO4)2·8((H2O),OH)

Comments: Bladed crystalline sprays of metakottigite crystals on matrix.
Location: Ojuela mine, Mapimi, Durango, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Metalodevite: Zn(UO2)2(AsO4)2·10(H2O)

Comments: Micro crystals of pale yellow metalodevite to 1 mm.
Location: Rivieral, Lodeve, Herault, Languedoc-Roussillon, France. Scale: Specimen Size 5 x 2 x 3 cm.
© Tom Loomis / Dakota Matrix

Metamunirite: Na2[V+++++2O6] or NaVO3

Comments: Colorless, acicular crystals of metamunirite.
Location: Burro Mine, Slick Rock District, San Miguel Co., Colorado, USA. Scale: Picture size 1.6 mm.
© Thomas Witzke / Abraxas-Verlag

Metanovacekite: Mg(UO2)2(AsO4)2·4-8(H2O)  
Novacekite: Mg(UO2)2(AsO4)2·12(H2O)

Comments: Yellow, translucent platy novacekite/metanovacekite crystal aggregate.
Location: Rabejac Mine, Olmet, Herault, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metanovacekite: Mg(UO2)2(AsO4)2·4-8(H2O)

Comments: Bright yellow crystalline metanovacekite coatings on white crystalline gypsum.
Location: Las Animas Mine, Municipio do Heuiles Serdan, Chihuahua, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metarossite: CaV2O6·2(H2O)

Comments: Light yellow metarossite on sandstone.
Location: Burro Mine, Slick Rock District, San Miguel Co., Colorado. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Metarossite: CaV2O6·2(H2O)

Comments: Bright yellow platy crystals to about 0.5mm covering sandstone matrix.
Location: Arrowhead Claim, San Miguel Co., Colorado, USA. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix