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Lawsonite crystallizes in the orthorhombic system in prismatic, often tabular crystals. It forms transparent to translucent colorless, white, and bluish to pinkish grey glassy to greasy crystals. Ilvaite is a sorosilicate of iron and calcium with formula: Ca Fe2 2Fe3 Si2O7O(OH).
Both manganese and magnesium substitute in the structure.
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Ilvaite crystallizes in the monoclinic system in black prismatic crystals and columnar masses. It has a Mohs hardness of 5.5 to 6 and a specific gravity of 3.8 to 4.1. It occurs in contact metamorphic rocks and skarn ore deposits. Ilvaite was first described in 1811 on the island of Elba and the name ilvaite from the Latin name ilva of the island. Commonly encountered species and varieties: Schorl species: Brownish black to black—schorl Dravite species: from the Drave district of Carinthia Dark yellow to brownish black—dravite Elbaite species: named after the island of Elba, Italy Red or pinkish-red—rubellite variety Light blue to bluish green—Brazilian indicolite variety (from indigo) Green—verdelite or Brazilian emerald variety Enstatite is a mineral; the magnesium endmember of the pyroxene silicate mineral series enstatite (Mg Si O3) - ferrosilite (Fe Si O3).
The magnesium rich members of the solid solution series are common rock-forming minerals found in igneous and metamorphic rocks.