1) Calcium mineral
Found on
https://www.crosswordclues.com/clue/ilvaite
Ilvaite is a sorosilicate of iron and calcium with formula: CaFe2+2Fe3+Si2O7O(OH). Both manganese and magnesium substitute in the structure. Ilvaite crystallizes in the orthorhombic 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 ...
Found on
http://en.wikipedia.org/wiki/Ilvaite
• (n.) A silicate of iron and lime occurring in black prismatic crystals and columnar masses.
Found on
http://thinkexist.com/dictionary/meaning/ilvaite/
Il'va·ite noun [ From Latin
Ilva , the island now called Elba.]
(Min.) A silicate of iron and lime occurring in black prismatic crystals and columnar masses.
Found on
http://www.encyclo.co.uk/webster/I/10
Ilvaite (yenite or jenite) is a silicate of iron and lime occurring in black prismatic crystals and columnar masses.
Found on
http://www.probertencyclopaedia.com/browse/HI.HTM
(Calcium Iron Silicate Hydroxide) Ilvaite is not a common mineral in rock shops. Its crystals are usually not all that attractive, but some specimens are real standouts with well-formed crystals with a shiny black color and an opaque submetallic luster. Its diamond-shaped crystals with wedge-like terminations can form very inter...
Found on
https://www.encyclo.co.uk/local/23719
No exact match found.
