Presentation :
Silica dioxide SiO2.
Crystal whose growth stopped and then continued a few million years later and which kept the trace of this stopping. Sometimes layers of various mineral...
Presentation:
Celestine (or Celestite) is a mineral composed of natural strontium sulfate, crystallizing in the orthorhombic crystal system.
Names) :
Celestine / Celestite
E...
Presentation :
Names) :
Astrophyllite.
Etymology :
From the Greek άστρον ("astron") to "star" and φύλλον ("phyllon") to "leaf", alluding to its habit of star-shaped vaporizati...
Presentation :
Etymology: from the Greek "barrus" = heavy, due to its high density.
Its genesis is mainly hydrothermal. It consists of barium, a crumb of lead, a hint of calcium and may co...
Presentation :
Etymology: from the Greek "barrus" = heavy, due to its high density.
Its genesis is mainly hydrothermal. It consists of barium, a crumb of lead, a hint of calcium and may co...
Presentation :
Names) :
Azurite.
Etymology:
From Persian lasaward = Blue (Beudant, 1824).
Color :
Light blue to dark blue to blue-purple sometimes almost black.
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