Grossular has a pale gooseberry-green color (whence its name) ; in serpentine, with idocrase, in the Wilni river, in Kamtschatka.
Topazolite is a honey-yellow garnet, in veins in serpentine ; has small yellow crystals ; found on the Mussa Alp, in Piedmont.
Aplome presents
the form of the dodecahedron, but the facets are striated, parallel to
the shorter diagonal; its color is brown, sometimes greenish; from
Sahla, in Sweden.
Melanite, from μέλας, black,
occurs in black dodecahedrons, sometimes modified in volcanic rocks,
on Monte Somma, in matter ejected by Vesuvius ; Frascati, Albano, near
Rome, the Brisgau, in beds on the older rocks at Arendel, in Norway.
Pyrenaite is
found in minute, black, symmetrical dodecahedrons, and was.so called
from its locality in the Pyrenees, and at the Pic Eves Lids, near
Bareges.
Ouwarowite bears
a close resemblance to the green garnet. It occurs in transparent
emerald-green dodecahedrons, with a hardness of 7.05—harder than the
garnet. It occurs at Bissersk, in Russia.
The
several varieties of garnet are quite diiferent in their composition ;
they all contain silicate of alumina, and variable proportions of the
silicates of lime, iron, and manganese, which substances have the
property of replacing one another without causing a change of
crystalline form. The »varieties of garnet are often classed as
distinct species, such as almandine, pyrope, dodecahedral garnet,
melanite, grossular, topazolite, aplome, essonite, cinnamon-stone,
Green-landite, pyrenaite, colophonite, allochroite, Romanzovite,
carbuncle, and ouwarowite. It is proper that garnet be divided into
precious and common ; the first being the transparent, rind the latter
the opaque variety. The pre-
