One ray is significantly sharper than the other. With all other black star stones, like black Star Moonstone, the mineral name must be added.Ĭan be confused with: the 4-rayed star of Star Diopside has a diagnostic feature, which, at least in theory, should render it unmistakable. This is misleading, as the name "Black Star" must, in accordance with trade practices, only be used for black Star Sapphires. Synonyms and trade names: particularly in India Star Diopside is very often offered as "Black Star". According to another view, it alludes to the two possible orientations of the prism faces of Diopside crystals. One interpretation says, this hints to the fact that Diopsides often appear as twinned crystals. Origin of name: from Greek δίς dis meaning double, ὄψις opsis meaning sight or vision and ἰδού idos meaning shape. It is only visible under single light in gems with a domed surface (cabochons, spheres, beads) (see asterism) The 4-rayed star is caused by reflection of light at needle-shaped inclusions of magnetite. It forms two complete series with Hedenbergite and Johannsenite. Diopside is a calcium-magnesium-silicate and one of the most common minerals of the pyroxene-group.
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