Kornerupine
id:
kornerupine-227-1214588
title:
Kornerupine
text:
Kornerupine is a rare boro-silicate mineral with the chemical formula (Mg,Fe2+)4(Al,Fe3+)6(SiO4,BO4)5(O,OH)2. It crystallizes in the orthorhombic – dipyramidal crystal system as brown, green, yellow to colorless slender tourmaline like prisms or in massive fibrous forms. It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.34. Its indices of refraction are nα=1.660 – 1.671, nβ=1.673 – 1.683 and nγ=1.674 – 1.684. It occurs in boron-rich volcanic and sedimentary rocks which have undergon
brand slug:
wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Kornerupine
date created:
2006-07-17T00:57:57Z
date modified:
2024-09-14T22:54:15Z
main entity:
{"identifier":"Q419092","url":"https://www.wikidata.org/entity/Q419092"}
image:
{"content_url":"https://upload.wikimedia.org/wikipedia/commons/0/0d/Kornerupine-162065.jpg","width":480,"height":640}
fields total:
13
integrity:
15