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A particularly fine specimen of fluorite, made up of several crystals. One of my favorite minerals!

Locality: Bergmännisch Glück Mine, Frohnau, Annaberg-Buchholz, Erzgebirge, Saxony, Germany

Size: 3 × 4.1 × 3.2 cm (1.2 x 1.6 x 2.3 in.)

Photo: © Wittig-Minerals /e-rocks. com

H/T: www.geologypage.com

#geology #minerals #fluorite

Burbankite, (Na,Ca)3(Sr,Ba,Ce)3(CO3)5
Yellowish hexagonal prisn of burbankite. The acicular crystals at upper left are aegirine.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 3.0 mm
collecting

Brookite, TiO2
Cluster of several black brookite crystals.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 1.1 mm
collecting

Birnessite, (Na,Ca,K)0.6(Mn4+,Mn3+)2O4·1.5H2O
Ranciéite, (Ca,Mn2+)0.2(Mn4+,Mn3+)O2·0.6H2O
Originally described as birnessite, new research showed to be a mixture with ranciéite.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 4.0 mm
collecting

Annite, KFe2+3(AlSi3O10)(OH)2
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 1.6 mm
collecting

Berthierine, (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
Ancylite-(Ce), CeSr(CO3)2(OH)·H2O
Two hexagonal pale green berthierine crystals plus 2 cololess ancylite-*Ce)_ crystals.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 1.6 mm
collecting

Stumbled across a nice August '22 mosaic of three 400mm images of Death Valley - stitched 'em and added a label version ( dougellison.smugmug.com/Projec )

Some #BushCapital #geology with a view from Shepherd’s Lookout near Belconnen, Canberra, overlooking the Murrumbidgee River. Early Silurian Walker Volcanics (dacitic ignimbrite) in the foreground forming the cliff.

Bavenite, Ca4Be2+xAl2-xSi9O26-x(OH)2+x (x = 0 to 1)
Pale yellow to white bavenite plates.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 4.0 mm

Barylite, BaBe2Si2O7
Two barylite crystals
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 1.0 mm

Baryte, Ba(SO4)
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 0.8 mm

Astrophyllite, K2NaFe2+7Ti2(Si4O12)2O2(OH)4F - the dark to light brown crustals.
Sphalerite, ZnS - the pale pink crystal just above center.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 4.0 mm

Astrophyllite, K2NaFe2+7Ti2(Si4O12)2O2(OH)4F

spray of thin light brown crystals.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 2.0 mm

Ashcroftine-(Y), K5Na5Y12Si28O70(OH)2(CO3)8·8H2O as fine fibers.
Aegirine, NaFe3+Si2O6 - the dark green crystals
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 3.2 mm

Arsenopyrite, FeAsSPoudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 0.9 mm

Ancylite-(Ce), CeSr(CO3)2(OH)·H2O
Very pale pink crystals on blades of albite.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 3.5 mm

Andradite, Ca3Fe3+2(SiO4)3
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 3.5 mm

Annite, KFe2+3(AlSi3O10)(OH)2
Pyrite, FeS2
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 4.0 mm

Arfvedsonite, NaNa2(Fe2+4Fe3+)Si8O22(OH)2
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 4.0 mm

Anatase, TiO2
Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 1.8 mm

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