2.78CT STUNNING UNTREATED NATURAL SINGLE SOURCE GREEN GOLDEN SPANISH SPHALERITE

Description

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Please remember, used is a 100x microscopic photography system.
The actual gem depicted is far smaller than the images and inclusions far easier to see than with the naked eye.
Pieces: 1
Shape: Round Faceted
Type: Sphalerite
(From only one source in the world in a natioal reserve in Spain this mine has been closed and no longer produces material in and effort to no longer disturb the environment)
Color: Greenish Brownish Yellow / Golden Color  (Stone is darker than may appear in photos)
Weight: 2.78 CT
Clarity: SI2-I  (Type III)
(
PLEASE; If unsure of what clarity means see chart below for a more detailed explanation also remember colored gems are graded with the naked eye and not a loupe
)
Size: 8.6 x 8.6 x 4.6 mm
Luster: Adamantine
Origin: Spain (A SINGLE SOURCE GEM FROM ONLY SPAIN)
Treatment: None
Hardness: 3.5 - 4.0 on MOHS
Sphalerite
((Zn,Fe)S) is a mineral that is the chief ore of zinc. It consists largely of zinc sulfide in crystalline form but almost always contains variable iron. When iron content is high it is an opaque black variety, marmatite. It is usually found in association with galena, pyrite, and other sulfides along with calcite, dolomite, and fluorite. Miners have also been known to refer to sphalerite as zinc blende, black-jack, and ruby jack.
Its color is usually yellow, brown, or gray to gray-black, and it may be shiny or dull. Its luster is adamantine, resinous to submetallic for high iron varieties. It has a yellow or light brown streak, a Mohs hardness of 3.5–4, and a specific gravity of 3.9–4.1. Some specimens have a red iridescence within the gray-black crystals; these are called "ruby sphalerite." The pale yellow and red varieties have very little iron and are translucent. The darker, more opaque varieties contain more iron. Some specimens are also fluorescent in ultraviolet light. The refractive index of sphalerite (as measured via sodium light, 589.3 nm) is 2.37. Sphalerite crystallizes in the isometric crystal system and possesses perfect dodecahedral cleavage.
VVS 1 & 2
x
VS 1
x
VS 2
x
SI 1
x
SI 2
x
Included
Extra Fine Quality. These gems have microscopic inclusions which are difficult to slightly difficult to see under a loupe with 10x magnification.
Very Fine Quality. Small pin-pricks are just visible to the scrutiny of the close naked eye. However, the beauty of the gem is not diminished in anyway.
Fine Quality. Small pin-pricks and feathers are just visible to the scrutiny of the close naked eye. However, the overall beauty of the gem is still not diminished.
Good Quality. These gems have inclusions which are fairly easy to see to the close naked eye. However, the overall beauty of the gem is still high.
Good to Medium-High Quality. These gems have inclusions which are fairly easy to see under the close naked eye. These inclusions are usually not really visible at an arm's length.
Medium to the lower qualities. Included gems with internal features that range from eye visible to very easily seen to the naked eye.
On Aug-02-07 at 11:48:41 PDT, seller added the following information:
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