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6323 results

Mineral

Alfredstelznerite

alfredstelznerite

Formula
Ca4(H2O)4[B4O4(OH)6]4(H2O)15
Algodonite - Locality: Houghton County, Michigan, USA - Exposed in the Mineralogical Museum, Bonn, Germany Mineral

Algodonite

algodonite

Formula
Cu1-ₓAsₓ (x ~0.15)
FOV 2.4 X 3.5 mm. Gift from the Horváths. Analyzed (CMN) find. This superb specimen of alicewilsonite-(YCe) is from the (analyzed) find made in 2000, and illustrated (under MSH UK-33A) in Horváth et al (2019 p. 496). However, in this photo, I have chosen to emphasize the stacked platy appearance of the aggregate, rather than their luster. From: Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada Mineral

Alicewilsonite-(Yce)

alicewilsonite-(YCe)
Transparent pale pink to colourless alicewilsonite-(YLa) crystals up to 150 µm in size, with white globular kamphaugite-(Y). FOV 1.5 mm. Specimen CMNMC 89063. Canadian Museum of Nature collection. Photos: François Génier. Mineral

Alicewilsonite-(Yla)

alicewilsonite-(YLa)

Formula
Na2Sr2YLa(CO3)6·3H2O
Aliettite Locality: Ingichka Mine (Ingichke Mine), Zirabulak Mts (Zirabulakskie Mts), Samarkand (Samarqand) Viloyati, Uzbekistan Greenish-grey massive Aliettite. Field of view 7 mm. Specimen and photo Leon Hupperichs. Mineral

Aliettite

aliettite

Formula
Ca0.2Mg6(Si,Al)8O20(OH)4·4H2O
Mineral

Allabogdanite

allabogdanite

Formula
(Fe,Ni)2P
Allactite Locality: Moss mine, Nordmark, Filipstad, Värmland, Sweden Description: Picture width 3 mm. Collection and photograph Christian Rewitzer Mineral

Allactite

allactite

Formula
Mn²⁺7(AsO4)2(OH)8
Mohs
4.5
Localidad: Cantera de talco de Trimouns, Luzenac, Ariège, Midi-Pyrénées, Francia. Ejemplar que muestra un nutrido grupo de cristales de allanita-(Ce) dispuestos aleatóriamente sobre una cavidad tapizada de dolomita y calcita. Este mineral de Elementos de Tierras Raras es un clásico de esta localidad francesa. Se presenta como cristales prismáticos muy alargados, con transparencia y color marrón a miel tostada. Medidas: 9,2 x 6,5 x 5,5 cm. Cristal principal: 6 x 1 mm. Encontrado en ±2004. Mineral

Allanite-(Ce)

allanite-(Ce)

Formula
CaCe(Al2Fe²⁺)[Si2O7][SiO4]O(OH)
Mineral

Allanite-(La)

allanite-(La)

Formula
CaLa(Al2Fe²⁺)[Si2O7][SiO4]O(OH)
Locality: Kingman Feldspar Mine (Kingman group of claims; Kingman Feldspar Quarry; Kingman Feldspar Quarries), Kingman area, Wallapai District, Cerbat Mts (Cerbat Range), Mohave Co., Arizona, USA Dimensions: 2.7 cm x 2.2 cm x 1.5 cm Allanite(Nd) with Allanite(Ce). Mineral

Allanite-(Nd)

allanite-(Nd)

Formula
CaNd(Al2Fe²⁺)[Si2O7][SiO4]O(OH)
Mineral

Allanite-(Sm)

allanite-(Sm)

Formula
(CaSm)(AlAlFe²⁺)O[Si2O7][SiO4](OH)
Image of allanite-(Y) sample: (a) sample NHM028251 of Neumann and Nilssen (Reference Neumann and Nilssen1962). Photos by H. Friis and R. Škoda. Mineral

Allanite-(Y)

allanite-(Y)

Formula
{CaY}{Al2Fe²⁺}(Si2O7)(SiO4)O(OH)
Colour
black
Allanpringite Locality: Mark Mine, Essershausen, Weilburg, Wetzlar, Hesse, Germany Field of view 4 mm. Specimen and photo Leon Hupperichs. Mineral

Allanpringite

allanpringite

Formula
Fe³⁺3(PO4)2(OH)3·5H2O
Mohs
3
Mineral

Allantoin

allantoin
Allargentum Locality: Harsted, Saxony, Germany Size: miniature, 3.2 x 2.7 x 1.4 cm Allargentum A fairly rare Silver-Antimony mineral, this specimen has well-defined crystals [Note: These formations are no crystals, but casts of the carbonate the allargentum is typically embedded in. - pH] interspersed with massive Allargentum, all on matrix. With such good metallic luster and actual crystals, this is a very fine specimen. Ex. Marilyn Dodge Collection. Mineral

Allargentum

allargentum

Formula
Ag1-ₓSbₓ (x=0.09-0.16)
Mohs
3.5
Alleghanyite Locality: Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USA (Locality at mindat.org) Alleghanyite is an exceptionally rare member of the humite group, and this specimen is unusually rich with gemmy brown microcrystals to 2 mm flatlaying along an approximately 3-cm vertical axis on this specimen . The matrix is a typical mix of franklinite/calcite/willemite and is highly fluorescent. 11 x 6.5 x 4 cm Mineral

Alleghanyite

alleghanyite

Formula
Mn²⁺5(SiO4)2(OH)2
Mineral

Allendeite

allendeite

Formula
Sc4Zr3O12
Mineral

Allochalcoselite

allochalcoselite

Formula
Cu¹⁺Cu²⁺5PbO2(SeO3)2Cl5
Mineral

Alloclasite

alloclasite

Formula
CoAsS
Allophane (Size ~ 3 cm) Locality: Maid of Sunshine Mine, Turquoise District (Courtland-Gleeson District), Dragoon Mts, Cochise County, Arizona, USA Mineral

Allophane

allophane

Formula
Al2O3(SiO2)1.3-2.0·2.5-3.0H2O
Mohs
3
Mineral

Alloriite

alloriite

Formula
(Na,K,Ca)24(Na,Ca)4Ca4(Si,Al)48O96(SO4)4(SO3,CO3)2(OH,Cl)2(H2O,OH)4
Mineral

Alluaivite

alluaivite

Formula
Na19(Ca,Mn²⁺)6(Ti,Nb)3Si26O74Cl·2H2O
Mineral of Custer County, South Dakota. These mineral images are free to use how you wish. Mineral

Alluaudite

alluaudite

Formula
(Na,Ca)(Mn,Mg,Fe²⁺)(Fe³⁺,Mn²⁺)2(PO4)3
Mineral

Almagreraite

almagreraite

Formula
CuZnMn⁴⁺3O8