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Minerals

6323 results

Mineral

Mavlyanovite

mavlyanovite

Formula
Mn5Si3
Mawbyite, Segnitite Locality: Alto das Quelhas do Gestoso Mines, Gestoso, Manhouce, São Pedro do Sul, Viseu District, Portugal Picture width 0.5 mm. Collection and photograph Christian Rewitzer Redbrown Mawbyite on yellow Segnitite. Analysed specimen Mineral

Mawbyite

mawbyite

Formula
Pb(Fe1.5,Zn0.5)(AsO4)2(OH)1.5(H2O)0.5
Mohs
4
Orange brown veinlet of the very rare Cu-Fe-Sn sulphide mineral mawsonite from the type locality in Tasmania (Mount Lyell Mines, Queenstown, West Coast Municipality, Tasmania, Australia) in a matrix of massive chalcopyrite. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Mawsonite

mawsonite

Formula
Cu6Fe2SnS8
Orange red sharp crystals of maxwellite, a very rare mineral only found in two localities worldwide in a white contrasting matrix. From: Squaw Creek Mine, Sierra County, New Mexico, United States of America. Mineral

Maxwellite

maxwellite

Formula
NaFe³⁺(AsO4)F
Mineral

Mayingite

mayingite

Formula
IrBiTe
Mineral

Mazorite

mazorite
Mineral

Mazzettiite

mazzettiite

Formula
Ag3HgPbSbTe5
Mazzite-Mg Locality: Mont Semiol (Mont Semiouse; Mont Simiouse), Châtelneuf, Saint-Georges-en-Couzan, Loire, Rhône-Alpes, France Field of view 3 mm. (ID uncertain, possible Offretite) Specimen and photo Leon Hupperichs. Mineral

Mazzite-Mg

mazzite-Mg

Formula
Mg5(Si26Al10)O72·30H2O
Mineral

Mazzite-Na

mazzite-Na

Formula
Na8(Si28Al8)O72·30H2O
Sky blue mbobomkulite crystal aggregates associated to an unknown grass green mineral from the type locality in Mbobokulu mine (Mbobo Mkulu Cave, Nelspruit, Ehlanzeni District, Mpumalanga Province, South Africa) and only one of the two known localities worldwide. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Mbobomkulite

mbobomkulite

Formula
(Ni,Cu)Al4((NO3)2,SO4)(OH)12 * 3H2O
White crystals of the very rare magnesium borate mineral associated to gypsum and halite from the type locality: Eagle Borax Spring, Death Valley, California, United States of America. Mineral

Mcallisterite

mcallisterite

Formula
Mg2[B6O7(OH)6]2 * 9H2O
Emerald green rounded crystal aggregates of the very rare tellurite mineral xocomecatlite associated to apple green mcalpineite from the famous Bambollita, Moctezuma mine in Mexico. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Mcalpineite

mcalpineite

Formula
Cu3(Te⁶⁺O6)
Sharp yellowish tan crystals of the extremely rare Fe-Al phosphate mineral mcauslanite from the type and only known locality worldwide in Nova Scotia (East Kemptville, Argyle, Yarmouth County, Nova Scotia, Canada). Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Mcauslanite

mcauslanite

Formula
Fe3Al2(PO4)3(PO3OH)F * 18H2O
Mcbirneyite is a very rare copper-vanadate mineral, forms tiny black crystals as inclusions or epitaxially grown with green stacked grown lammerite. The associating minerals are tiny black-red lyonsite needles, emerald green piypite needles and rich black microcrystalline coatings of hematite and orange microcrystalline coating of antimony bearing rutile. Very interesting and super rare combination. From: Yadovitaya Fumarole, Great Fissure, Tolbachik, Far Eastern Region, Russian Federation. Mineral

Mcbirneyite

mcbirneyite

Formula
Cu3(VO4)2
An extremely rare black grain of an intergrown mixture of grimaldiite and mcconnellite from the type locality for both species: Merume River, Kamakusa, Potaro-Siparuni Region, Guyana. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Mcconnellite

mcconnellite

Formula
CuCrO2
Mineral

Mccrillisite

mccrillisite

Formula
NaCs(Be,Li)Zr2(PO4)4·1-2H2O
Exhibit in the Redpath Museum, McGill University - Montreal, Quebec, Canada. Mineral

Mcgillite

mcgillite

Formula
(Mn,Fe)8Si6O15(OH)8Cl2
Mcgovernite Locality: Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USA (Locality at mindat.org) Size: 3.5 x 2.7 x 1.9 cm. Mcgovernite is a very rare arsenate, unique in the world to the Sterling Mine of New Jersey. Mcgovernite is also the mineral species with the largest number of atoms in the unit cell. This specimen is extremely rare and exceptional, in that much of the piece consists of lustrous, bronzy-brown crystal plates, along with aggregates of mcgovernite. Crystals reach 5 mm. Mcgovernite usually occurs as thin coatings or as radiating spherical sprays of crystals. This extreme rarity is very well crystallized for the species. Mineral

Mcgovernite

mcgovernite

Formula
Mn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21
Mcguinnessite Locality: Premier Chemicals Mine (Gabbs Magnesite-Brucite mine; Basic Refractories mine; Basic mine), Gabbs District, Nye County, Nevada, USA (Locality at mindat.org) Blue botryoidal crust of McGuinnessite. Field of view 6 mm. Specimen and photo Leon Hupperichs. Mineral

Mcguinnessite

mcguinnessite

Formula
CuMgCO3(OH)2
Mohs
2.5
Mineral

Mckelveyite-(Nd)

mckelveyite-(Nd)

Formula
NaCaBa3Nd(CO3)6·3H2O
Yellow rounded crystal of the very rare yttrium mineral mckelveyite-(Y) from the famous Mont Saint Hilaire (Québec, Canada). Mineral

Mckelveyite-(Y)

mckelveyite-(Y)

Formula
NaBa3(Ca,U)Y(CO3)6·3H2O
Mckinstryit fotografiert im Museum für Naturkunde Berlin Fundort:Silver City in New Mexico (USA) Mineral

Mckinstryite

mckinstryite

Formula
Ag5Cu3S4
4.2 x 3.2 x 2.1 cm. Here is a lovely and extremely rare sample of the hydrated calcium sodium arsenate mcnearite from the type locality in Sainte Marie-aux-mines. This specific locality operated for a short time (from 1932 to 1940) and now is designated with archaeological mining district status, so collecting is not allowed. The vein system surrounding this mine had been worked since the middle of the 1500s. Despite the short time that Gabe Gottes was in production, it actually produced the type specimens for eight different species including mcnearite. This piece features pearl white patches of mcnearite sitting on host rock matrix. This piece is accompanied by a classic label from Josef Vajdak/Pequa Rare Minerals. You can read Joe's biography here: http://www.minrec.org/labels.asp?colid=1371. Mineral

Mcnearite

mcnearite

Formula
NaCa5(AsO4)(HAsO4)4 * 4H2O
Medaite Locality: Molinello Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy (Locality at mindat.org) Size: 5.9 x 3.2 x 1.8 cm. A thin drusy crust on matrix is the very rare mineral medaite: a manganese, calcium, vanadium arsenic, silicate hydroxide. The medaite has sparkling luster and a rose red color. This specimen is from the type locality in Italy and is, I am told, quite rich for the species. Mineral

Medaite

medaite

Formula
Mn²⁺6V5+Si5O18(OH)