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Gemstones are mentioned in connection with the breastplate of the High Priest of Israel (Book of Exodus, 38:17–20; 39:10–13), the treasure of the King of Tyre (Book of Ezekiel, 28:13), and the foundations of the New Jerusalem (Book of Tobit, 13:16–7, in the Greek text, and more fully, Book of Revelation, 21:18–21).
Recognizing the habit can aid in mineral identification and description, as the crystal habit is an external representation of the internal ordered atomic arrangement. [1] Most natural crystals, however, do not display ideal habits and are commonly malformed. Hence, it is also important to describe the quality of the shape of a mineral specimen:
Hornblende has a hardness of 5–6, a specific gravity of 3.0 to 3.6, and is typically an opaque green, dark green, brown, or black color. It tends to form slender prismatic to bladed crystals, diamond-shaped in cross section, or is present as irregular grains or fibrous masses.
The true identity of this stone has been a source of confusion since at least the first century; the modern identification of leshem with jacinth seems to have been popularised by Martin Luther, who may in turn have been following a fourth-century tradition. [6]
Strictly speaking, the word refers to a growth habit that is slender and tapering to a point. Prismatic crystals are not acicular; however, colloquial usage has altered the commonly understood meaning of the word. When writing for mineralogical publications, authors should restrict their usage of "acicular" to crystals with the tapering growth ...
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