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Black crystals of the very rare Mn-Sb-As oxide manganostilbite from the TL in Sweden (Brattfors Mine, Nordmark, Filipstad, Värmland County, Sweden). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Manganostibite

manganostibite

Formula
Mn²⁺7Sb⁵⁺As⁵⁺O12
Pale pink crystal aggregates of the very rare Mn mineral manganotychite from the type locality in Lovozero (Lovozero Massif, Murmansk Oblast, Russian Federation) and only one of the two known localities worldwide. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Manganotychite

manganotychite

Formula
Na6Mn²⁺2(CO3)4(SO4)
Manganrockbridgeite (Field of view: 0.7 mm) Locality: Hagendorf South Pegmatite, Hagendorf, Waidhaus, Neustadt an der Waldnaab District, Upper Palatinate, Bavaria, Germany Description: Type specimen Photograph Christian Rewitzer 5.2022 Mineral

Manganrockbridgeite

manganrockbridgeite

Formula
Mn²⁺2Fe³⁺3(PO4)3(OH)4(H2O)
Manganvesuvianite Locality: Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org) NOT a Gaudefroyite ! this one fooled us at first, too! It is a SUPERB mangan-vesuvianite with deep wine-red color when backlit, so you can be sure of the ID. This specimen features xls of the highest quality and the best lustre, almost glassy in brightness - rare for the species. There is some damage to smaller crystals, but most major crystals are complete, and the display is phenomenal. The matrix is sparkling, minutely crystallized andradite garnet. The large single crystal atop is doubly-terminated and almost 2 cm long tip to tip. 4.2 x 3.9 x 3.3 cm Mineral

Manganvesuvianite

manganvesuvianite

Formula
Ca19Mn³⁺(Al,Mn³⁺,Fe³⁺)10(Mg,Mn²⁺)2(Si2O7)4(SiO4)10O(OH)9
Mineral

Mangazeite

mangazeite

Formula
Al2SO4(OH)4·3H2O
Mineral

Manitobaite

manitobaite

Formula
Na16Mn²⁺25Al8(PO4)30
Manjiroite, Todorokite, Calcite Locality: Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org) Size: 9.2 x 8.8 x 6.7 cm. Manjiroite and todorokite are RARE to uncommon hydrated manganese oxides. This exceptionally rich and showy specimen consists of bedded, dark gray, lamellar manjiroite altering to todorokite with really neat-looking vugs lined with glassy calcite crystals. Some of the lamellar manganese oxides are chatoyant! A nifty and unusual specimen from the Willy Israel Collection, who purchased this excellent piece from well-known dealer Clive Queit in 1986. Mineral

Manjiroite

manjiroite

Formula
Na(Mn⁴⁺7Mn³⁺)O16
Mohs
4
Outstanding black crystal of the Ba-Ti-V mineral mannardite on a contrasting matrix, from the type locality: Rough claims, Kechika River, British Columbia, Canada. Mineral

Mannardite

mannardite

Formula
Ba(Ti4+6V³⁺2)O16
Porous masses and crusts of glassy grey mansfieldite from the type locality associated to sky blue unknown crystals. Mineral

Mansfieldite

mansfieldite

Formula
AlAsO4·2H2O
Mantienneite, is an extremely rare K-Mg-Al-Ti phosphate found only in 3 localities worldwide, it's present here as a lot of about 1 mm brown granules in a capsule. Some of the granules have microcrystals of the mineral. From: Anloua, Martap, Vina, Adamaoua Region, Cameroon. Mineral

Mantienneite

mantienneite

Formula
(H2O)2Mg2(Al2Ti)(PO4)4(OH)2(H2O)10·4H2O
Mineral

Manuelarossiite

manuelarossiite

Formula
PbCaAlF7
:A STEM image of shocked ankerite shows tiny crystallites of maohokite (Mhk) and magnesioferrite (Mfr) embedded in calcite (Cal)." Photo and caption are from Chen, M., Shu, J., Xie, X., & Tan, D. (2018) Maohokite, a post‐spinel polymorph of MgFe2O4 in shocked gneiss from the Xiuyan crater in China. Meteoritics & Planetary Science: 2018: 1-8. https://doi.org/10.1111/maps.13222 It is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Mineral

Maohokite

maohokite

Formula
MgFe2O4
Mineral

Maoniupingite-(Ce)

maoniupingite-(Ce)

Formula
(Ce,Ca)4(Fe³⁺,Ti,Fe²⁺,☐)(Ti,Fe³⁺,Fe²⁺,Nb)4Si4O22
Outstanding dark green microcrystals of the extremely rare Zn-Fe arsenate mineral mapìmite from the TL in Ojuela mine, Mexico on the typical brown matrix of the Ojuela specimens. Mineral

Mapimite

mapimite

Formula
Zn2Fe³⁺3(AsO4)3(OH)4·10H2O
Mineral

Mapiquiroite

mapiquiroite

Formula
(Sr,Pb)(U,Y)Fe2(Ti,Fe³⁺)18O38
Mineral

Marathonite

marathonite

Formula
Pd25Ge9
Marcasite from chalk Locality : Cap Blanc Nez France. Size :8x6cm Mineral

Marcasite

marcasite

Formula
FeS2
Optical microphotograph of marchettiite holotype. From: Mount Cervandone, Monte Cervandone area, Devero Alp, Baceno, Verbano-Cusio-Ossola Province, Piedmont, Italy. Mineral

Marchettiite

marchettiite

Formula
C5H7N5O3
Mineral

Marcobaldiite

marcobaldiite

Formula
Pb12(Sb3As2Bi)∑6S21
Mineral

Margaritasite

margaritasite

Formula
Cs2(UO2)2(VO4)2·H2O
Margarite Locality: Chester Emery Mines, Chester, Hampden County, Massachusetts, USA (Locality at mindat.org) Size: 13.9 x 12.0 x 8.9 cm. This remarkable specimen features a large display face the size of a big grapefruit covered with upright, platy crystals of margarite. It is extremely rare for margarite to crystallize and 99% of all margarite from there is massive xline material. Margarite is typically found in either masses of platy crystals, intergrown, or what is typical for the location, veins or veinlets. In general, the thicker the better at this location with some of the thicker veins of margarite reaching an inch or two, and maintaining a pink color. This one is atypical, since the margarite looks to have formed along a slip face, allowing the 3D growth; the one here is thus a little unusual based on other historic specimens from this locality in East Coast collections (per Jim Chenard, pers. comm.). It also has some diaspore and rutile in association. Ex. Academy of Natural Sciences Philadelphia Collection. Mineral

Margarite

margarite

Formula
CaAl2(Si2Al2)O10(OH)2
Margarosanite Locality: Parker Shaft, Franklin, Sussex Co., New Jersey Size: miniature, 4.1 x 1.8 x 1.6 cm Margarosanite Small bits of the very rare margarosanite (fluorescent blue), embedded in nasonite, from this classic locality. From the Parker Shaft. Ex. John White Collection. Mineral

Margarosanite

margarosanite

Formula
Pb(Ca,Mn²⁺)2(Si3O9)
Mineral

Mariakrite

mariakrite
Marialite Locality: Marble occurrence, Morogoro, Uluguru Mts (Uruguru Mts), Morogoro Region, Tanzania Original description: A 2.3 cms tall crystal. JSS specimen and photograph. Mineral

Marialite

marialite

Formula
Na4Al3Si9O24Cl