8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc.,
with additional anions, without H2O
N : With only large cations,
(OH, etc.):RO4 = 0.33:1
Related
to:
Apatite
Group. Apatite Subgroup. Apatite
Supergroup. The fluorine analogue of Chlorapatite and Hydroxylapatite.
The phosphate analogue of Svabite. The Ca5 analogue of Belovite-(Ce), Belovite-(La), and Kuannersuite-(Ce).
As
prismatic hexagonal crystals, elongated on [0001], dominated
by {1010} and {1011}, to 2 m; as complex tabular to
discoidal crystals flattened on {0001}, typically with
many forms; granular, globular to reniform, nodular,
massive.
Often
fluorescent; exhibiting bright yellow or blue-white fluorescence under
UV light. May also be phosphorescent, especially the manganoan varieties.
Also strongly thermoluminescent at times.
The
most common rock-forming phosphate mineral. Accessory
in most igneous rocks, important in syenites, alkaline
rocks, carbonatites, granite pegmatites. Common in marbles
and skarns, Ca-rich regional metamorphic rocks, Alpine-type
fissures, and hydrothermal tin veins. An essential component
of sedimentary phosphorites, common as a detrital or
diagenetic component in oolitic ironstones and phosphatic
carbonate rocks and shales. Residual in laterites.
Apatite
is not a specific mineral name but the name of a series of minerals that
includes Fluorapatite, Chlorapatite
and Hydroxylapatite. Apatite is also a generic
name used to describe any of the three minerals which have not been specifically
identified through analytical methods. Fluorapatite is by far the most common
of the three to be used for gemstones but is usually
refered
to simply as "Apatite" in the gem trade. Fluorapatite is the fluorine (F)
analogue of Chlorapatite, containing chlorine (Cl),
and the water-rich (OH) Hydroxylapatite. It is difficult to tell
the three apart and various amounts of fluorine, chlorine and water
are present in most mineral specimens. Fluorapatite is also the phosphate (PO) analogue of Svabite. The
three minerals of the Apatite series are also members
of the Apatite Group of minerals that includes
Mimetite, Pyromorphite, Svabite and
Vanadinite.
Apatite is fairly common througout the
world and a modified form of Hydroxylapatite is the main constituent of human
bones and dental enamel.
Apatite occurs in almost all igneous rocks but is usually just small disseminated grains or
cryptocrystalline fragments.
Large, well formed crystals can be found in certain contact
metamorphic rocks. Gem quality Apatite crystals are found in a number of places around the world,
including Brazil, Burma, Mexico and Madagascar.
Apatite
gems are available in colors of green,
blue, violet, purple, pink, yellow, brown and colorless.
Neon blue to blue-green Apatite from Madagascar
is one of the rarest and
most sought after colors. Blue cat's-eye Apatite from
Brazil and Madagascar is also
rarely available. Green Apatite has been
called asparagus stone and a bluish-green variety
of Apatite originally found in Arendal, Norway has been
called moroxite. Apatite can be a magnificent
gem when properly cut although it is too soft for most jewelry
settings. Apatite is the defining reference mineral for 5 on the Mohs scale
of hardness. Apatite
often exhibits bright yellow or blue white fluorescence under
UV light and may also be phosphorescent, especially the manganoan varieties.
It is also strongly thermoluminescent at times.
Apatite was
named in 1786 by German geologist Abraham Gottlob Werner (1749-1817), professor of mining and mineralogy at the Freiberg Mining Academy,
Germany. Werner named the mineral from
the Greek
word άπατάω
(apatein)
meaning to deceive or to be misleading
because it was often confused
with other minerals such as Peridot and
Beryl. The specific mineral that
Werner had described as Apatite was reclassified in
1860 as Fluor-apatite by the German mineralogist
Karl Friedrich August Rammelsberg (1813-1899). Rammelsberg added the "Fluor-" prefix in allusion to the dominance of fluorine (F)
in the composition. In
2008 Fluorapatite
was renamed Apatite-(CaF) in an article titled "Tidying
up Mineral Names: an IMA-CNMNC Scheme for Suffixes,
Hyphens and Diacritical Marks" in the Mineralogical
Record, vol. 39, no. 2 (March–April 2008), page
132,
but this name was then reversed and renamed Fluorapatite
by the IMA in
2010. Despite the naming and renaming, it is still most
often called Apatite.
A
few of the localities for fine Apatite crystals
include: at Ehrenfriedersdorf, Saxony, Germany. From
Untersulzbachtal, Salzburg, Austria. At Panasqueira,
Portugal. From near Pech, Kunar Province, Afghanistan.
At Chumar Bakhoor, Nagar, Gilgit district, Pakistan.
In Brazil, at the Morro Velho gold mine, Nova Lima,
Minas Gerais and at Currais Novos, Rio Grande do Norte. From Llallagua, Potosí, Bolivia. At Cerro
de Mercado, Durango, Mexico. From the Pulsifer quarry,
Mt. Apatite, Auburn, Androscoggin County, Maine, USA.
In Canada, large crystals from southeastern Ontario,
as in Renfrew County, and in adjoining southwestern Quebec,
as in Ottawa County, etc. An important ore in carbonatites;
in Russia, in the Khibiny and Kovdor massifs, Kola Peninsula;
from the Slyudyanka region, Lake Baikal, eastern Siberia.
At Phalaborwa, Transvaal, South Africa. From the Jacupiranga
mine, São Paulo, and at Tapira, Minas Gerais, Brazil.
In the Mt. Weld carbonatite, 35 km south of Laverton,
Western Australia. At Ankarafa, Vohémar District, Sava Region, Antsiranana Province, Madagascar.
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