Ilvaite is a sorosilicate of iron and calcium with formula: . Both manganese and magnesium substitute in the structure. Ilvaite crystallizes in the monoclinic system in black prismatic crystals and columnar masses. It is black to brownish black to gray and opaque. It has a Mohs hardness of 5.5 to 6 and a specific gravity of 3.8 to 4.1. Ilvaite is structurally related to lawsonite.
via Wikipedia infobox
Ilvaite is a sorosilicate of iron and calcium with formula: . Both manganese and magnesium substitute in the structure. Ilvaite crystallizes in the monoclinic system in black prismatic crystals and columnar masses. It is black to brownish black to gray and opaque. It has a Mohs hardness of 5.5 to 6 and a specific gravity of 3.8 to 4.1. Ilvaite is structurally related to lawsonite.
It occurs in contact metamorphic rocks and skarn ore deposits. It also occurs less commonly in syenites.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).