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Arisite-(Ce) Locality: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada Description: The arisite rosettes average ~ ⅔ mm. Via Jean-Pierre Beckerich MOB coll. Tiny, pale lilac, thin foliated MSH UK 60 = IMA 2009-013 = Arisite-(Ce). For years UK60 languished in the “zombie” pile of MSH UKs that, for one reason or another, could not be submitted to IMA. However sufficiently good xls have been found at Aris (which has both -(Ce) and -(La) varieties.) Associated minerals on this specimen include small, but well formed, thich tabular nepheline and "eudialyte". The environment is probabvly sodalite xenolith. Arisite-(Ce) exhibts REE absorbtion lines. (According to Tony Steede, the pattern at MSH is reasonably distinctive.) Updated June 2013 with a new full res image with a broader view which inludes a few of the "eudialyte" xls. Mineral

Arisite-(Ce)

arisite-(Ce)

Formula
NaCe2(CO3)2[F2ₓ(CO3)1-ₓ]F
Mineral

Arisite-(La)

arisite-(La)

Formula
NaLa2(CO3)2[F2ₓ(CO3)1-ₓ]F
White single crystal of the very rare borate aristarainite from the TL in Argentina (Tincalayu Mine, Salar Del Hombre Muerto, Los Andes, Salta, Argentina). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Aristarainite

aristarainite

Formula
Na2MgB12O20 * 8H2O
Armalcolite and phlogopite Field of view: 1.5 mm Locality: La Aljorra Quarries, Cartagena, Murcia, Spain Mineral

Armalcolite

armalcolite

Formula
(Mg,Fe²⁺)Ti2O5
Plenty of black microcrystals of the rare Mn arsenite mineral armangite in a white contrasting matrix from the type and only known locality worldwide: Långban, Filipstad, Värmland County, Sweden. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Armangite

armangite

Formula
Mn²⁺26As³⁺18O50(CO3)(OH)4
Mineral

Armbrusterite

armbrusterite

Formula
K5Na7Mn15[(Si9O22)4](OH)10 * 4H2O
Mohs
3.5
Mineral

Armellinoite-(Ce)

armellinoite-(Ce)

Formula
Ca4Ce4+(AsO4)4·H2O
Armenite Locality: Isenwegg, Wasen Alp, Ganter valley, Simplon pass area, Brig, Wallis (Valais), Switzerland (Locality at mindat.org) Size: 3.2 x 2.2 x 1.5 cm. Armenite is exceptionally uncommon, especially in large euhedral crystals. This piece has glassy, lustrous, white crystals of armenite to 1.3 cm on matrix of smaller crystals. This is a rare hydrated, barium, calcium, aluminum silicate from the famous Simplon Pass, in Switzerland. This fine specimen was found in a freak and lucky find of the early 1990s. Mineral

Armenite

armenite

Formula
BaCa2(Al6Si9)O30·2H2O
Dark green crystals of the vare zirconium mineral armstrongite from the type locality in Mongolia (Khan-Bogdo Massif, Gobi Desert, Mongolia) and one of the only 4 confirmed locality worldwide. Armstrongite was named after the first man who landed on the Moon in 1969, Neil Armstrong. Mineral

Armstrongite

armstrongite

Formula
CaZr(Si6O15)·2H2O
Colour
brown
Mineral

Arrheniusite-(Ce)

arrheniusite-(Ce)
Mineral

Arrojadite-(Bana)

arrojadite-(BaNa)

Formula
BaNa3(NaCa)Fe²⁺13Al(PO4)11(PO3OH)(OH)
Arrojadite-(KFe) Locality: Rapid Creek, Dawson Mining District, Yukon Territory, Canada (Locality at mindat.org) A solid plate with sharp chocolatey xls to 6mm. EXCEPTIONAL FOR THE SPECIES! These are from a find of 3 years ago and are among the richest examples of the species recovered. this is a solid plate, that can even be broken up into many equally good reference specimens. 4 x 3.5 x 0.75 cm Mineral

Arrojadite-(Kfe)

arrojadite-(KFe)

Formula
{KNa}{Fe²⁺☐}{Ca}{Na2☐}{Fe²⁺13}{Al}(PO4)11(HPO4)(OH)2
Mineral

Arrojadite-(Kna)

arrojadite-(KNa)

Formula
KNa3(CaNa2)Fe²⁺13Al(PO4)11(PO3OH)(OH)2
Mineral

Arrojadite-(Pbfe)

arrojadite-(PbFe)

Formula
PbFe²⁺(CaNa2)Fe²⁺13Al(PO4)11(PO3OH)(OH)2
Mineral

Arrojadite-(Srfe)

arrojadite-(SrFe)

Formula
SrFe²⁺(CaNa2)Fe²⁺13Al(PO4)11(PO3OH)(OH)2
Mineral

Arsenatrotitanite

arsenatrotitanite

Formula
NaTi(AsO4)O
Nutrido grupo de cristales de mimetita, muy alargados, alguno de ellos biterminado, brillantes, translúcidos y con un tono amarillo suave. Estos ejemplares son muy poco habituales en mina Ojuela. Se acompaña de agregados de diminutos cristales de color amarillo a anaranjado de tsumcorita-arsenbrackebuschita. Se disponen en una cavidad de la matriz de goethita. El ejemplar ha sido analizado. Se ha publicado en la revista "Paragénesis" (1-2017). Medidas: 7.0 x 5.5 x 5.0 cm. Cristal principal: 20 x 2 mm. Ejemplar con análisis Mineral

Arsenbrackebuschite

arsenbrackebuschite

Formula
Pb2Fe³⁺(AsO4)2(OH)
Arsendescloizite, Mimetite Locality: Ojuela Mine, Mapimí, Municipio de Mapimí, Durango, Mexico (Locality at mindat.org) Green Arsenodescloizite with yellowish mimetite. Picture width 3 mm. Collection and photograph Christian Rewitzer Mineral

Arsendescloizite

arsendescloizite

Mohs
4
Arsenic Locality: Ronna Mine, Kladno, Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic (Locality at mindat.org) Size: miniature, 4.2 x 3.2 x 3 cm Native Arsenic CRYSTALS Native arsenic is itself rare, but to have crystals of it makes this a true find. These very rare mm-size crystals have remarkably good form, luster, and a sort of steely-gray color. This is an important piece, for a native elements suite! It comes from Josef Vajdak, one of the recognized experts on the exceptionally interesting mineralogy of Kladno 4.2 x 3.2 x 3 cm Mineral

Arsenic (Native)

arsenic (native)

Formula
As
Mohs
3.5
Reddish orange crystal aggregates of the rare Mn-arsenate mineral arseniopleite from the TL in Sweden (Sjögruvan, Grythyttan, Hällefors, Örebro County, Sweden). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Arseniopleite

arseniopleite

Formula
(Ca,Na)NaMn²⁺(Mn²⁺,Mg,Fe²⁺)2(AsO4)3
Arseniosiderite Locality: Roman?che-Thorens, Sa?ne-et-Loire, Rh?ne-Alpes, France (TYPE LOCALITY for BOTH SPECIES) Size: small cabinet, 6.4 x 6.2 x 5.6 cm Arseniosiderite in Romancheite A very rich specimen with shiny tigers-eye-like veins of arseniosiderite running through matrix of rich, massive Romancheite. The arseniosiderite is technically crystallized, forming lamellar crystals completely filling the veins they grew in. Ex. Jean Chervet Collection. Mineral

Arseniosiderite

arseniosiderite

Formula
Ca2Fe³⁺3O2(AsO4)3(H2O)2·H2O
Mohs
4.5
Black microcrystals of the extremely rare mineral IMA 2016-045 arsenmarcobaldiite on a white contrasting matrix.Analyzed specimen by SCXRD and EDS by C.Biagoni and S.Magnanelli. Part of the holotype specimen. All the very few known specimens come from a small block of rock found in an old dump between Arsiccio and Pollone mines.From: Verzalla, Sant'Anna di Stazzema, Tuscany, Italy. Mineral

Arsenmarcobaldiite

arsenmarcobaldiite
Orange microcrystals of the very rare mineral Mn-As silicate arsemmedaite from the TL in Molinello mine (Molinello Mine, Ne, Graveglia Valley, Genova Province, Liguria, Italy). Ex. Erich Laskowski collection (USA). Mineral

Arsenmedaite

arsenmedaite

Formula
Mn²⁺6 As5+Si5O18(OH)
Mineral

Arsenobenauite

arsenobenauite

Formula
SrFe³⁺3(AsO4)(AsO3OH)(OH)6