ALMANDINE GARNET Faceted HIGH GRADE Crystal Gemstone Pear AUTHENTIC

Description

This high quality faceted almandine garnet gemstone weighs 0.35 carats. It measures 6 mm by 4 mm by 3 mm.
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This is a very nice, and high quality faceted almandine garnet pear gemstone. It's expertly carved and ready to mount in a ring, earrings, or a pendant, or you can just keep it as a pretty little specimen. If you have any questions, do not hesitate to ask me. Thanks so much for visiting my listing and have a great day!
Almandine
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"Almandin" redirects here. For the racehorse, see Almandin (horse).
Not to be confused with Amandine (disambiguation).
Almandine
Almandin.jpg
General
Category
Nesosilicate
Formula
(repeating unit)
Fe2+3Al2Si3O12
Strunz classification
9.AD.25
Crystal system
Cubic
Crystal class
Hexoctahedral (m3m)
H-M symbol: (4/m 3 2/m)
Space group
Ia3d
Identification
Color
reddish orange to red, slightly purplish red to reddish purple and usually dark in tone
Cleavage
none
Fracture
conchoidal[1]
Mohs scale hardness
7 - 7.5
Luster
greasy to vitreous
Streak
white
Specific gravity
4.05 (+.25, -.12)[1]
Polish luster
vitreous to subadamantine[1]
Optical properties
Single refractive, and often anomalous double refractive[1]
Refractive index
1.790 (+/- .030)[1]
Birefringence
none
Pleochroism
none
Dispersion
.024[1]
Ultraviolet fluorescence
inert
Absorption spectra
usually at 504, 520, and 573nm, may also have faint lines at 423, 460, 610 and 680-690nm[1]
References
[2][3][4]
Victorian almandine garnet brooch
Almandine (/ˈælməndɪn/), also known incorrectly as almandite, is a species of mineral belonging to the garnet group. The name is a corruption of alabandicus, which is the name applied by Pliny the Elder to a stone found or worked at Alabanda, a town in Caria in Asia Minor. Almandine is an iron alumina garnet, of deep red color, inclining to purple. It is frequently cut with a convex face, or en cabochon, and is then known as carbuncle. Viewed through the spectroscope in a strong light, it generally shows three characteristic absorption bands.[5]
Almandine is one end-member of a mineral solid solution series, with the other end member being the garnet pyrope. The almandine crystal formula is: Fe3Al2(SiO4)3. Magnesium substitutes for the iron with increasingly pyrope-rich composition.
Almandine, Fe2+3Al2Si3O12, is the ferrous iron end member of the class of garnet minerals representing an important group of rock-forming silicates, which are the main constituents of the Earth's crust, upper mantle and transition zone. Almandine crystallizes in the cubic space group Ia3d, with unit-cell parameter a ≈ 11.512 Å at 100 K.[6]
Almandine is antiferromagnetic with the Néel temperature of 7.5 K. It contains two equivalent magnetic sublattices.[7]
Contents
1
Occurrence
2
Cultural significance
3
See also
4
References
Occurrence
Almandine
Almandine occurs rather abundantly in the gem-gravels of Sri Lanka, whence it has sometimes been called Ceylon-ruby. When the color inclines to a violet tint, the stone is often called Syriam garnet, a name said to be taken from Syriam, an ancient town of Pegu (now part of Myanmar). Large deposits of fine almandine-garnets were found, some years ago, in the Northern Territory of Australia, and were at first taken for rubies and thus they were known in trade for some time afterwards as Australian rubies.
Almandine is widely distributed. Fine rhombic dodecahedra occur in the schistose rocks of the Zillertal, in Tyrol, and are sometimes cut and polished. An almandine in which the ferrous oxide is replaced partly by magnesia is found at Luisenfeld in German East Africa. In the United States there are many localities which yield almandine. Fine crystals of almandine embedded in mica-schist occur near Wrangell in Alaska. The coarse varieties of almandine are often crushed for use as an abrasive agent.
Cultural significance
Connecticut has almandine garnet as its state gemstone.[8]