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Minerals

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Mica - Muscovite & Feldspar - Brazil Mineral

Mica

Formula
Sheet silicate group
Mohs
2–3
Colour
Colourless, brown, black
Mineral

Michalskiite

michalskiite
Micheelsenite from Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada Mineral

Micheelsenite

micheelsenite

Formula
(Ca,Y)3Al(HPO4,CO3)(CO3)(OH)6 * 12H2O
Michenerite, Chalcopyrite (Largest crystal size: 0.5 mm) Locality: Vermilion Mine, Denison Township, Sudbury District, Ontario, Canada Original description: A michenerite crystal in chalcopyrite. This is the largest of two crystals found and as far as I know the first crystal ever found. Mineral

Michenerite

michenerite

Formula
PdBiTe
Mineral

Michitoshiite-(Cu)

michitoshiite-(Cu)
Microcline Locality: Hashupa, Shigar Valley, northeast of Skardu, Pakistan Size: small cabinet, 6.5 x 6.4 x 4.6 cm Microcline This particular specimen is complete, untwinned, doubly terminated, and on a matrix of smaller microcline crystals. Mineral

Microcline

microcline

Formula
KAlSi3O8
Mohs
6
Microlite Locality: Amelia (Amelia Court House), Amelia County, Virginia, USA (Locality at mindat.org) Size: 2.4 x 1.8 x 1.5 cm. Microlite is an uncommon oxide found in albitized granite pegmatites and is the tantalum analogue of pyrochlore. The sharp, lustrous, multi-faceted, variegated, brown crystal is from a famous Virginia locale - the Amelia Courthouse. One of the last major American Civil War battles was held nearby in April, 1865. This is a nearly pristine, complete-all-around crystal from this classic locale. Ex. Carl Davis Collection. Mineral

Microlite

microlite
White short prismatic crystals of the very rare mineral microsommite from Monte Somma, Vesuvius, Campania, Italy. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Microsommite

microsommite

Formula
Na4K2Ca2(SO4)(Si6Al6O24)Cl2
Mineral

Midbarite

midbarite

Formula
Ca3Mg2(V2Si)O12
Mineral

Middendorfite

middendorfite

Formula
K3Na2Mn5Si12(O,OH)36·2H2O
Mineral

Middlebackite

middlebackite

Formula
Cu2C2O4(OH)2
Yellow/brown crystals of the extremely rare mineral mieite-(Y) from the famous Ytterby deposit in Sweden and associated to keiviite-(Y) and fergusonite-(Y) after the original label of the Vandenbroucke Museum. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Mieite-(Y)

mieite-(Y)

Formula
Y4Ti(SiO4)2O[F,(OH)]6
Miersite Locality: Broken Hill Proprietary Mine (Proprietary Mine; BHP Mine), Broken Hill, Yancowinna County, New South Wales, Australia (Locality at mindat.org) Size: 4.9 x 3.2 x 2.8 cm. This piece features bright yellow, eye-visible miersite crystals, richly emplaced on ore matrix. This is a very rich specimen with unusual display aesthetics for this important and very rare silver/copper species (it is a startlingly simple silver and copper iodide, (Ag,Cu)I ). A very rich specimen, obviously validated, which I exchanged from the South Australian Museum last year (2008). The Museum label accompanies the piece. One seldom sees such a piece for sale (let alone, so well documented). Mineral

Miersite

miersite

Formula
(Ag,Cu)I
Mineral

Miessiite

miessiite

Formula
Pd11Te2Se2
Miguelromeroite Locality: Veta Negra Mine, Pampa Larga district, Tierra Amarilla, Copiapó Province, Atacama Region, Chile (Locality at mindat.org) Size: 1.5 x 1.3 x 1.0 cm. Originally sold as Villyaellenite, these specimens have now been identified as miguelromeroite (IMA2008-066). This beautiful and super-rich thumbnail is aesthetically covered with sprays of gemmy, lustrous, vivid pink crystals of miguelromeroite crystals and is from the 1997 find by Terry Szenics at the Veta Negra Mine of Chile. Mineral

Miguelromeroite

miguelromeroite

Formula
MnMn2Mn2(AsO4)2(HAsO4)2 * 4H2O
Mineral

Miharaite

miharaite

Formula
PbCu4FeBiS6
Mikasaite ore displayed at Mining Museum of Akita University Mineral

Mikasaite

mikasaite

Formula
Fe2(SO4)3
Mineral

Mikecoxite

mikecoxite

Formula
[CHg4]OCl2
Mineral

Mikehowardite

mikehowardite
A microscopic view of yellow spheres made of platy mikenewite crystals (Specimen number R210021). The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Mineral

Mikenewite

mikenewite

Formula
Mn²⁺(S⁴⁺O3)·3H2O
Dark orange crystals of the extremely rare mineral milanriederite (IMA 2018-041) from the type and only known locality worldwide, the famous Kombat mine in Namibia, close to Tsumeb. Mineral

Milanriederite

milanriederite

Formula
Ca19Fe³⁺Al4(Mg4Al4)Si18O67(OH)11
Milarite Locality: Jaguaraçu pegmatite (José Miranda mine; José Pinto mine; Carneirinho mine), Jaguaraçu, Minas Gerais, Southeast Region, Brazil (Locality at mindat.org) Size: miniature, 4 x 3 x 2.9 cm Milarite Gorgeous, pale yellow crystals of milarite to 1.6 cm are really well-displayed on this miniature matrix. It is most unusual to get specimens with such a rich association - usually the milarites were found spaced out much more infrequently for the surface area. These are about 20 years old, and none of quality have been found since the mid-1980s to my knowledge. I think this is just a superb miniature for both the significance of the species, AND the richness and aesthetics of the piece itself. The crystals are also of large size for both the locality and for the species, surpassed only by a few freakish specimens from the Alps perhaps. Mineral

Milarite

milarite

Formula
KCa2(Be2AlSi12O30)·nH2O
Mohs
6
Mineral

Milkovoite

milkovoite
Millerite Locality: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada Original description: FOV 1.2 x 1.4 mm. Via Jean-Pierre Beckerich. Millerite is very rare at MSH. This is from breccia, the only reported environment for millerite at MSH. Not analyzed. (What's there to analyze? The darn thing is so tiny that if I didn't have an arrow pointing at it I'd never find it again.) But I don't think it's capillary pyrite. At MSH that seems to be found only in hornfels. Mineral

Millerite

millerite

Formula
NiS
Mohs
3.5