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Trigonal crystals

Proustite, lustrous, sharply terminated 8 mm crystal with calcite crystals. Schneeberg, Erzgebirge, Saxony, Germany. Ruby Burma 2.jpg South Africa Hematite 21mm 38 mm hematite barrel-form crystal. Shabry Village, Ekaterinburg, Ekaterinburgskaya Oblast', Middle Urals, Urals Region, Russia.
A large (43 mm) tabular crystal of ilmenite from Zagi Mountain, Federally Administered Tribal Area, near Peshawar, Pakistan Calcite nailhead crystal, 32 mm across,  Dalnegorsk, Russia. 15 mm calcite scalenohedral crystal, Khuff Formation, Huqf, Oman. 15 mm calcite scalenohedral crystal, Khuff Formation, Huqf, Oman.
Calcite, 65 mm doubly terminated form dominated by scalenohedral faces. Dalnegorsk, Russia. Calcite in lustrous gemmy crystals, 55 mm. Sarbay Mine, Rudniy, Kazakhstan. Calcite in lustrous gemmy crystals, 55 mm. Sarbay Mine, Rudniy, Kazakhstan. Calcite in lustrous gemmy crystals, 55 mm. Sarbay Mine, Rudniy, Kazakhstan.
Calcite, complex 45 mm crystal on 11 cm matrix. Berry Materials Quarry, North Vernon, Jennings County, Indiana. Calcite Rotherhope 67mm 1922 5.jpg 19 mm prismatic crystal of siderite with pinacoid terminations. Siete Suyos Mine, Atocha-Quechisla District, Bolivia. 19 mm prismatic crystal of siderite with pinacoid terminations. Siete Suyos Mine, Atocha-Quechisla District, Bolivia.
19 mm prismatic crystal of siderite with pinacoid terminations. Siete Suyos Mine, Atocha-Quechisla District, Bolivia. Rhodochrosite, sharp rhombohedral crystals in 4 cm cluster. Mont Saint Hilaire, Quebec, Canada. Pezzottaite, transparent 20 mm gem crystal, Sakavalena, Madagascar. Pezzottaite, transparent 20 mm gem crystal, Sakavalena, Madagascar.
Burma rubellite 20mm Zoned tourmaline.jpg Green tourmaline pinacoid.jpg Burma brown tourmaline.jpg