8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
N : With only large cations, (OH, etc.):RO4 = 0.33:1
Apatite Supergroup. Apatite Group. Svabite
Group (Dana). Fluorapatite-Svabite
Series. Also forms a series toward Hedyphane and Mimetite with an increase of Pb and Cl.
The arsenate analogue of Fluorapatite.Isostructural with
is a rare calcium arsenate fluoride mineral
that belongs to the Apatite Group of minerals that includes
Mimetite, Pyromorphite, Svabite and
Svabite is at least partially isomorphous with Apatite and Mimetite.
Isomorphous means that
two (or more) minerals share the same crystal structure but have different chemistries.
Svabite is also
the arsenate analogue of Fluorapatite.
When the mineral Fluorapatite
occurs near arsenic-bearing ores, some of the phosphate ions
are often replaced by arsenate ions. When the
percentage of arsenate ions exceeds that of the
phosphate ions the mineral becomes Svabite.
reddish orange under LW UV and yellow under SW UV light. If you place your cursor over the picture above
you will see
the reddish orange fluorescence of Svabite under longwave
UV light. Svabite specimens found at Långban, Filipstad, Värmland, Sweden
may be associated with another fluorescent arsenate
was named in 1891 by Swedish
geologist and mineralogist Sten Anders Hjalmar Sjögren (1856-1922)
in honor of Anton von Swab
(Svab) (1703-1768), Swedish chemist, mineralogist, and mining official at
Bergmästaregatan in Skåne and Kronoberg. Swab made important discoveries
in the fields fo chemistry and mineralogy. He refined zinc from calamine and later
from blende. Together with Axel Cronstedt, Swab developed a commercial
process for refining zinc and thus greatly aided the manufacture of
brass in Sweden. Swab also discovered the first natural occurrence of native antimony
in 1783 from a sample collected from the Sala Silver
Mine in the Bergslagen mining district of Sala, Västmanland, Sweden.
distribution: in Sweden, found in the Harstigen
mine, near Persberg, at Jakobsberg, and at Långban,
Värmland; from Kesebol, Dalsland; in the Ultevis
district, Jokkmokk, Swedish Lappland. In the Clara Mine,
near Oberwolfach, Black Forest, Germany.
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