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This specimen contains red almandine,whitish-gray feldspar and white quartz. Almandine is iron-aluminum garnet, having ideal composition Fe3Al2Si3O12. It may contain magnesium, manganese or calcium as significant impurities. Like all garnets, almandine forms dodechahedral (12 sided) crystals whith each face having a rhombohedral shape. This sample is about 11 cm across. The white on the lower left is paint used to label the specimen. Mineral

Almandine

almandine

Formula
Fe²⁺3Al2(SiO4)3
Mohs
7.5
Mineral

Almarudite

almarudite

Formula
K(☐,Na)2(Mn,Fe,Mg)2[(Be,Al)3Si12]O30
Mohs
6
Almeidaite Locality: Unnamed deposit, Novo Horizonte, Bahia, Brazil Dimensions: 17 mm x 12 mm x 4 mm Part of fully developed cristal of Almeidaite exhibiting the typical crackled surface patterns and metallic shine. Acquired from Luiz Alberto Dias Menezes Filho with autographed label. Specimen from the type locality in Brazil. Mineral

Almeidaite

almeidaite

Formula
PbZn2(Mn,Y)(Ti,Fe³⁺)18O36(OH,O)2
Mineral

Alnaperbøeite-(Ce)

alnaperbøeite-(Ce)

Formula
(CaCe2.5Na0.5)(Al4)(Si2O7)(SiO4)3O(OH)2
Orange crystals of the extremely rare and new mineral alpeite (IMA 2016-072), a Mn vanadate of complex formula, from the type locality (Monte Alpe Mine, Genova Province, Liguria, Italy) and only one of the two known localities worldwide. Mineral

Alpeite

alpeite

Formula
Ca4Mn³⁺2Al2(Mn³⁺Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6
Alperiste, Slavíkite (File of view: 12 mm) Locality: Prenterwinkelgraben (Bärndorfer Graben), Bärndorf, Rottenmann, Liesing - Palten valley, Styria, Austria Original description: Anhedral grains and aggregates of alpersite (white, with very slight greenish tint; SXRD- and EDS-analysed) on pale yellow-brown crusts of slavikite (PXRD- and EDS-analysed). This specimen is described in Kolitsch, U. (2014): 1992) Alpersit und Slavikit vom Prenterwinkelgraben bei Barndorf, Paltental, Steiermark. P. 137 in Niedermayr, G. et al. (2014): Neue Mineralfunde aus Österreich LXIII. Carinthia II, 204./124., 65-146. Mineral

Alpersite

alpersite

Formula
Mg(SO4)·7H2O
Mohs
2.5
Mineral

Alsakharovite-Zn

alsakharovite-Zn

Formula
NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7H2O
Alstonite, Witherite Locality: Brownley Hill Mine (Bloomsberry Horse Level), Nenthead, Alston Moor District, North Pennines, North and Western Region (Cumberland), Cumbria, England, UK (Locality at mindat.org) Size: small cabinet, 9.7 x 4.1 x 3.7 cm Alstonite with Witherite This rich specimen dates back to , I would expect, the heyday here in the mid-1800s. It is covered by very sharp, alstonites to 6mm. Atop is a 2-cm cluster of witherite, as well. I think the orange dot atop is the remnant of a very old glue label. In any case, its surprisingly an attractive specimen, although there is some value to the even more attractively prepared, and exhaustively descriptive, old labels! Mineral

Alstonite

alstonite

Formula
BaCa(CO3)2
These mineral images are free to use how you wish. Mineral

Altaite

altaite

Formula
PbTe
Oustanding yellow green crystals of the extremely rare mineral alterite (IMA 2018-070) from the type and only known locality worldwide: Cliff Dwellers Lodge, Coconino County, Arizona, United States of America. Alterite, Zn2Fe3+4(SO4)4(C2O4)2(OH)4· 17H2O, is the 23rd oxalate species, first natural Zn oxalate mineral to date, so it is at the same time an organic and an inorganic mineral. Mineral

Alterite

alterite

Formula
Zn2Fe³⁺4(SO4)4(C2O4)2(OH)4 * 17H2O
Althausite, Hematite, Lizardite Locality: Overntjern Quarry, Overntjern, Modum, Buskerud, Norway Dimensions: 8.0 cm x 4.0 cm x 3.0 cm Dark reddish brown, subhedral crystals of althausite to 3cm in a serpentine-talc matrix with dark gray subhedral hematite crystals and aggregates to 2cm. A very good example for the species. Ex. Paulo Matioli collection. Photos by Tom and Melissa Campbell. Mineral

Althausite

althausite

Formula
Mg4(PO4)2(OH,O)(F,☐)
Really outstanding yellow crystals of the extremely rare Th-U mineral althupite from the type and only known loclaity worldwide in Kobokobo (Kobokobo Pegmatite, Mwenga, South Kivu, DR Congo). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Althupite

althupite

Formula
AlTh(UO2)7(PO4)4O2(OH)5·15H2O
Mineral

Altisite

altisite

Formula
Na3K6Ti2Al2Si8O26Cl3
Alum-(K) Locality: Alum King Occurrence (Big Star), Henry District, Antelope Range, Sevier County, Utah, USA (Locality at mindat.org) Size: 5.4 x 5.0 x 2.7 cm. Lustrous, water-clear to translucent, super sharp, zoned potassium alum crystals from an uncommon Utah locality - the Alum King Mine in Piute County. The piece has neat, stepped triangular form, reflecting the isometric crystal structure. Ex. John Ydren Collection. Mineral

Alum-(K)

alum-(K)

Formula
KAl(SO4)2·12H2O
Mineral

Alum-(Na)

alum-(Na)

Formula
NaAl(SO4)2·12H2O
Aluminite - Locality: Newhaven, Sussex, England - Exposed in the Mineralogical Museum, Bonn, Germany Mineral

Aluminite

aluminite

Formula
Al2SO4(OH)4·7H2O
Tiny speck of native aluminium in a capsule. Native aluminium is one of the rarest native elements that can be found in a mineral collection. From: Bulla Island, Caspian Sea, Qobustan District, Azerbaijan. Mineral

Aluminium (Native)

aluminium (native)

Formula
Al
Mineral

Alumino-Oxy-Rossmanite

alumino-oxy-rossmanite

Mohs
7
Locality: ⓘ Nashik District (Nasik District), Maharashtra, India Dimensions: 14.8 cm x 10.2 cm x 6.5 cm Aluminoceladonite-included Heulandite. Mineral

Aluminoceladonite

aluminoceladonite

Formula
K(Mg,Fe²⁺)Al(Si4O10)(OH)2
Pink crystal aggregates of the rare mineral aluminocerite-(Ce) on matrix. From Montoso Quarries, Bagnolo Piemonte, Cuneo Province, Piedmont, Italy. Ex. Erich Laskowski collection (USA). Mineral

Aluminocerite-(Ceca)

aluminocerite-(CeCa)

Formula
(Ce6Ca3)☐Al(SiO4)3(SiO3OH)4(OH)3
Aluminocopiapite Locality: Montcada hill quarry (Pedrera del Turó de Montcada), Montcada i Reixac, Vallès Occidental, Barcelona, Catalonia, Spain Dimensions: 4 cm x 2 cm x 1 cm Description: Orange botryoidal aggregates of flattened aluminocopiapite (analized by SEM-EDS) crystals. Mineral

Aluminocopiapite

aluminocopiapite

Formula
(Al,Mg)Fe³⁺4(SO4)6(OH,O)2·20H2O
Mineral

Aluminocoquimbite

aluminocoquimbite

Formula
AlFe(SO4)3·9H2O
Mineral

Aluminomacfallite

aluminomacfallite

Formula
Ca2Mn³⁺AlMn³⁺(SiO4)(Si2O7)(OH)3
Mineral

Aluminomagnesiohulsite

aluminomagnesiohulsite

Formula
Mg2AlO2(BO3)
Colour
black