amedim

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Mookaite Jasper.  http://topgems.homestead.com/gemstone_information_mookaite.html

Mookaite Jasper comes only from Mooka Creek in Western Australia. It is a fossiliferous sedimentary rock left by decomposed belemnite casts or in some rare cases, impressions of ammonites.

El Espato de Islandia es una variedad de calcita que cristaliza en esta forma cúbica limpia y transparente.

Iceland spar is a clear, transparent, colorless crystallized variety of calcite (calcium carbonate, Large pieces are split along natural cleavage planes to form natural rhombs. Iceland spar is probably best known for exhibiting the optical propert