SPINELLE
Noun
spinelle (plural spinelles)
Dated form of spinel.
Source: Wiktionary
Spi*nel", Spi*nelle", n. Etym: [F. spinelle, or LL. spinellus,
perhaps from L. spina a thorn, a prickle, in allusion to its pointed
crystals.] (Min.)
Definition: A mineral occuring in octahedrons of great hardness and various
colors, as red, green, blue, brown, and black, the red variety being
the gem spinel ruby. It consist essentially of alumina and magnesia,
but commonly contains iron and sometimes also chromium.
Note: The spinel group includes spinel proper, also magnetite,
chromite, franklinite, gahnite, etc., all of which may be regarded as
composed of a sesquioxide and a protoxide in equal proportions.
Source: Webster’s Unabridged Dictionary 1913 Edition