Ficheiro:Ruby cristal.jpgRuby crystal before faceting, length 0.8 inches (2 cm). Picture made without a camera by laying the crystal on a flat bed scanner. Picture released to
Ficheiro:Rubis, calcite 5.JPG; Jagdalak ; Jagdalik) ruby deposit, Surobi District (Sorobi District), Kabol Province (Kabul Province), Afghanistan - cristal : 17 mm author name string:
Ficheiro:Corundum, calcite 3.jpgcalcite : Luc Yen Mine, Luc Yen, Yenbai (Yen Bai) Province, Vietnam - cristal : 20 mm author name string: Parent Géry URL: https://commons.wikimedia
Ficheiro:Corundum, calcite 4.jpgcalcite : Luc Yen Mine, Luc Yen, Yenbai (Yen Bai) Province, Vietnam - cristal jusqu'à 50 mm Wikimedia username: Parent Géry author name string: Parent