- rhombohedral class
- крист. ромбоэдрический класс
The New English-Russian Dictionary of Radio-electronics. F.V Lisovsky . 2005.
The New English-Russian Dictionary of Radio-electronics. F.V Lisovsky . 2005.
Amethyst — Infobox mineral name = Amethyst category = Mineral variety boxwidth = boxbgcolor = imagesize = caption = formula = Silica (silicon dioxide, SiO2) molweight = color = violet habit = 6 sided prism ending in 6 sided pyramid (typical) system =… … Wikipedia
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