Native Copper psuedomorph of Aragonite
Locality: Corocoro, Pacajes Province, Pa Paz Department, Bolivia
Native copper with partially oxidized, green surface which has replaced prior aragonite, perfectly preserving the hexagonal crystal shape.

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@mineralsandsomerocks
Native Copper psuedomorph of Aragonite
Locality: Corocoro, Pacajes Province, Pa Paz Department, Bolivia
Native copper with partially oxidized, green surface which has replaced prior aragonite, perfectly preserving the hexagonal crystal shape.

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Pirquitasite on Matrix
Locality: Oploca Vein, Pirquitas Mine, Rinconada Department, Jujuy, Argentina
*Pirquitasite Type Locality*
Fine, black, striated crystals of Pirquitasite (left side of sample) in a brown matrix (potentially sphalerite) associated with colloform-esque banding of a black mineral (potentially cassiterite)
Potassic-magnesio-fluoro-Arfvedsonite with Eudialyte, Vlasovite, and Fluorite (+/- Gittinsite)
Locality: Kipawa alkaline Complex, Sheffield Lake, Les Lacs-du-Témiscamingue, Témiscamingue RCM, Abitibi-Témiscamingue, Québec, Canada
Black, glossy Potassic-magnesio-fluoro-Arfvedsonite in light pink Eudialyte matrix, associated with minor honey-yellow grains of Vlasovite, deep purple Fluorite, and potentially white, chalky Gittinsite associatied with the Vlasovite. *Gittinsite Type Locality*
Gustavite in carbonate matrix
Locality: Arsenic Mine, Lower Rotgülden Lake, Lungau, Salzburg, Austria
Thin vein of elongated, striated, bright silver crystals of Gustavite cutting through white carbonate matrix. There is also minor tarnished, grey Arsenopyrite.
Tintinaite in Quartz
Locality: Mária Mine, Rožňava, Rožňava County, Košice Region, Slovakia
Sprays of elongated, very lustrous, metallic, silvery-grey Tintinaite crystals cutting through white Quartz matrix.

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Vikingite in Quartz
Locality: Siglitz adit, Siglitz - Bockhard Gold Mining District, Bad Gastein, St. Johann im Pongau District, Salzburg, Austria
Bright, metallic, silvery-grey crystals of Vikingite in a yellowish quartz matrix.
Petrified Wood partially replaced by Fluorite
Locality: Chemnitz Hilbersdorf, Saxony, Germany
Flat, cut slab of milky-white petrified wood with worm-like vein of deep purple Fluorite partially replacing it. Chemnitz is the only known locality of Fluorite replacing petrified wood.
Holubite
Locality: Staročeské Lode, Kutná Hora, Central Bohemian Region, Czech Republic
Thin veins and small individual grains of bright, steel-grey Holubite in a white quartz matrix. Type, and only, locality for the recently discovered (2023) Holubite.
Matildite on Chalcopyrite in matrix
Locality: Clara Mine, Oberwolfach, Freiburg Region, Baden-Württemberg, Germany
Tiny, octahedral crystal of silver-coloured, metallic Matildite mounted on a larger crystal of brassy Chalcopyrite in a milky white Calcite matrix.
Acanthite
Locality: Imiter Mine, Tinghir Province, Drâa-Tafilalet Region, Morocco
Freestanding perfectly formed dendrite of silvery-grey Acanthite.

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Libethenite and Cornetite on matrix
Locality: Star of the Congo Mine, Lubumbashi, Haut-Katanga, DR Congo
*Cornetite Type Locality*
Lustrous, deep green, euhedral crystals of Libethenite followed by a thin band of electric-blue Cornetite on matrix.
Tučekite and Ullmannite in Quartz matrix
Locality: Adler Mine, Siegen, Siegerland, North Rhine - Westphalia, Germany
Bright, brassy-coloured Tučekite with silvery-grey Ullmannite in a milky-white quartz matrix.
Nickeline (pink/peach) and Maucherite (pinkish grey) with a rim of Gersdorffite (bluish grey) overgrown by intergrown Parkerite (light grey, twinning) and Hauchecornite (dull pink), then overgrown by Matildite (darker grey, rough texture).
Locality: Easter-Duffy Deposit, East Arm Region, Greater Slave Lake, NWT, Canada
Reflected Plane Polarized Light, 200X Magnification
Quick laundry list of minerals most people will have never heard of!
Native Silver (tarnished yellow) overgrown by Nickeline (pink) and Rammelsbergite (whitish grey rim on Nickeline) and Gersdorffite (light grey, euhedral crystals) and partially replaced by intergrown Acanthite (dull, scratched grey) and Stephanite (slightly lighter, "cleaner" grey)
Locality: Easter-Duffy Deposit, Greater Slave Lake, Northwest Territories, Canada
Plane Polarized Reflected Light, 50X Magnification
Crocoite
Locality: Dundas, Tasmania, Australia

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Native Iron in Basalt in epoxy mount
Locality: Bühl, Weimar, Ahnatal, Kassel Region, Hesse, Germany
Faceted Tri-Colour Axinite (1 Carat)
Locality: Jumair Ali Mine, Parachinar, Kurram District, Khyber Pakhtunkhwa Province, Pakistan