 | | Book (edition) | | Chrysoberyl
Spinel
Topaz
Tourmaline
The Garnets
Feldspar Group
Zircon
Peridot
69
92
117
150
167
171
175
185
195...book would be more sensibly shared out among
a group of authors/gemmologists, each member tackling his...Edition
being extracted from ‘Gems of the Silica Group’ to form a separate chapter.
I have also reintroduced...First Edition
For two decades, an earlier work of mine – Practical Gemmology – has
proved a useful elementary...some reason, the stones are better placed in a group forming a small subchapter.
In the technical section |  | | Book | | are defined by chemical
composition, structural group, and crystal
system, with one or two references...Si04) and fayalite
(Fe 2 Si0 4 ) (see Olivine Group), group names,
such as mica for all the minerals with...pyrite) and also
to a group of minerals having the same structure
{e.g., pyrite group).
The purpose of this...sense that does not refer to a mineral
species or group proper, no special designating
typeface is utilized-e...2 4 ), a
mineral species assigned to the spinel group
because of its spinel structure; quartz syenite |  | | Book | | taken into account
recent IMA-sanctioned changes in group nomenclature,
and is up-to-date to the summer of...immediate resul t of this exception for the Zeolite group
has been t h e prol i fe ra t i o n of cases o...Magnesium aslrophyllite). The "minerals" Clnysotile
group i ng s i m i l ar m i n e ra l s ; furt h e rmore...l y
expanded for use with
considered series (group) names, a l t hough s t i l l most
subsequently...examples of this is
"Chabazite", which is now a group name that includes
Chabazile-Ca and Chabazite-Na |
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