Mineral Specimen Images (M)

Magnesiocopiapite: MgFe+++4(SO4)6(OH)2·20(H2O)

Comments: Pale yellow opaque aggregate of magnesiocopiapite.
Location: Denver Mine, Santa Cruz County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magnesiocoulsonite: MgV+++2O4  
Tremolite: [ ]Ca2Mg5Si8O22(OH)2

Comments: Black grains of magnesiocoulsonite with green chromian tremolite. Metallic bronze grain of thiospinelid of kalininite-florensovite series is visible in the upper right corner of the image.
Location: Pereval Marble Quarry, Slyudyanka (Sludyanka), Lake Baikal area, Irkutskaya Oblast', Prebaikalia (Pribaikal'e), Eastern-Siberian Region, Russia. Scale: FOV is 3x2 mm.
© Pavel M. Kartashov

Magnesioferrikatophorite: Na2Ca(Mg,Fe++)4Fe+++Si7AlO22(OH)2

Comments: Double-terminated short-prismatic crystal of titanoan (2.17 % TiO2) magnesioferrikatophorite from a nephelin-syenite pegmatite.
Location: Northeast slope, Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Not Given.
© Pavel M. Kartashov

Magnesioferrite: MgFe+++2O4  
Diopside: CaMgSi2O6

Comments: Very dark brown Magnesioferrite Pleonaste (Iron-Magnesium spinel) with cream colored Calcite and gray green diopside.
Location: Aldan, Gon River, Russia. Scale: 6 x 4.5 cm.
© Fabre Minerals

Magnesioferrite: MgFe+++2O4  
Bromellite: BeO

Comments: A micro, water color, hexagonal or barrel shaped crystal of white bromellite to about 0.3 mm on yellowish calcite with associated black magnesioferrite.
Location: Langban, Varmland, Sweden. Scale: 18x9x10mm.
© Tom Loomis / Dakota Matrix

Magnesiofoitite: [ ](Mg2Al)Al6(Si6O18)(BO3)3(OH)4

Comments: Aggregate of greenish-brown acicular crystals of magnesiofoitite.
Location: Kyonosawa, Mitomi-mura, Yamanashi prefecture, Chubu region, Honshu island, Japan. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Magnesiogedrite: (Mg,Fe++)5Al2Si6Al2O22(OH)2  
Gedrite: [ ]Mg5Al2Si6Al2O22(OH)2

Comments: Dark gray cleavage fragment of magnesiogedrite (gedrite).
Location: Bamble, Telemark, Norway. Scale: See Image.
© Rruff Database

Magnesiohastingsite: NaCa2(Mg4Fe+++)Si6Al2O22(OH)2

Comments: Dark black-brown crystalline massive magnesiohastingsite.
Location: Afrikanda Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magnesiohogbomite-2N2S: (Al,Fe++,Fe+++,Mg,Ti,Zn)11O15(OH)

Comments: Massive, fine-grained magnesiohogbomite-2N2S.
Location: Ruoutevare, Kvikkjokk, Lappland, Sweden. Scale: Specimen Size 3 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Magnesioholmquistite: Li2(Mg,Fe++)3Al2Si8O22(OH)2  
Holmquistite: [ ](Li2Mg3Al2)Si8O22(OH)2

Comments: Dark blue thin bladed crystals of holmquistite (magnesioholmquistite) in amphibolite.
Location: Uto, Sodermanland, Sweden. Scale: See Image.
© Rruff Database

Magnesiohornblende: Ca2[Mg4(Al,Fe+++)]Si7AlO22(OH)2

Comments: Dark greenish-black massive magnesiohornblende.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 5.5 cm.
© Thomas Witzke / Abraxas-Verlag

Magnesiohulsite: (Mg,Fe++)2(Mg,Fe+++,Sn++++)O2(BO3)

Comments: Green fibrous massive magnesiohulsite.
Location: Itenyurgin, Chukot Peninsula, Magadan District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magnesiokatophorite: Na(CaNa)Mg4AlSi7AlO22(OH)2

Comments: Black crystalline magnesiokatophorite in syenite.
Location: Kipiwa Complex, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magnesiopascoite: Ca2Mg[V10O28]·16H2O

Comments: Intergrowth of orange magnesiopascoite crystals on V-U oxide replacement of organic material. CanMin v46:.
Location: Blue Cap mine, near La Sal, San Juan County, Utah, U.S.A.. Scale: Crystal size 2.2mm across.
© Canadian Mineralogist

Magnesioriebeckite: [ ]Na2[(Mg,Fe++)3Fe+++2]Si8O22(OH)2

Comments: Crystal of magnesioriebeckite showing massive and asbestosform habits.
Location: Cochabamba Dept, Bolivia. Scale: 2.5 cm.
© John Attard

Magnesiosadanagaite: NaCa2[Mg3(Al,Fe+++)2]Si5AlO22(OH)2

Comments: Magnesiosadanagaite mantled by phlogopite (brown) adjacent to corundum (variety ruby) in white marble. (CanMin, v46:151).
Location: Dattaw mine, Mogok Stone Tract, Mandalay Division, Myanmar. Scale: Picture size 4 cm.
© Canadian Mineralogist

Magnesiostaurolite: [ ]4Mg4Al16(Al,[ ])2Si8O40[O6,(OH)2]

Comments: White crystals of magnesiostaurolite in rose quartz.
Location: Dora Maira Massif, Cuneo Province, Piedmont, Italy. Scale: Specimen Size 42 x 27 x 25 mm.
© Sergey Vasiliev / Systematic Mineralogy

Magnesiotaaffeite-2N2S: Mg3Al8BeO16

Comments: Faucetted purple magnesiotaaffeite. These specimens are very rare and un-cut samples ever rarer..
Location: Ceylon gem gravels, Ratnapura, Sri Lanka. Scale: See Image.
© Dave Barthelmy

Magnesiotaaffeite-2N2S: Mg3Al8BeO16  
Magnesiotaaffeite-6N3S: (Mg,Fe++,Zn)2Al6BeO12  
Taaffeite:

Comments: BSE image of magnesiotaaffeite-6N3S (Mgt-6N3S) with a central lamella of magnesiotaaffeite-2N2S (Mgt-2N2S). Other minerals Spl: spinel; Chl: clinochlore.
Location: Polymetamorphic dolomite marble at Eastern Alps, Stubenberg, Styria, Austria. (CanMin, v46:1195). Scale: See Image.
© Canadian Mineralogist

Magnesiotaaffeite-6N3S: (Mg,Fe++,Zn)2Al6BeO12  
Magnesiotaaffeite-2N2S: Mg3Al8BeO16  
Taaffeite:

Comments: BSE image of magnesiotaaffeite-6N3S (Mgt-6N3S) with a central lamella of magnesiotaaffeite-2N2S (Mgt-2N2S). Other minerals Spl: spinel; Chl: clinochlore.
Location: Polymetamorphic dolomite marble at Eastern Alps, Stubenberg, Styria, Austria. (CanMin, v46:1195). Scale: See Image.
© Canadian Mineralogist