1 Quartz – Gems stone
Pink Color Tourmaline Specimen

Pink Color Tourmaline Specimen

Aquamarine Specimen,Crystal Tourmaline,Green Color Tormaline More »

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen,Crystal Tourmaline, More »

Tourmaline Cuts Shapes

Tourmaline Cuts Shapes

Tourmaline Cuts Shapes,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

watermelon Tourmaline

watermelon Tourmaline

watermelon Tourmaline,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen

watermelon Tourmaline,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

 

Category Archives: Quartz

Topaz Specimen

TOPAZ
COLOUR : Clear,red ,yellow,orange,gray,blue
COMPOSITION :AI2[F2/SiO4] +OH +[Cr,Fe,Mn]
CRYSTAL STRUCTURE :Orthorhombic
HARDNESS :8specific gravity :3.4-3.6
LUSTER: Vitreous
TRANSPARENCY : Transparent
METAPHYSICA:Power,wisdom,healing ,relaxation,initiative ,artistic inspiration,joy,self-realization
OTHER:Aligned with Virgo,Leo,and Aquarius star sign
Topaz occurs in a range of different colours : deep golden yellow topaz (sometimes sherry topaz )and pink topaz are the most valuable ; blue and green stones are also popular .Natural pink stones are rare-most pink topaz is heat –treated yellow material .Much colourless topaz is irradiated and heat-treated to a range of blues, some almost indistinguishable from aquamarine when seen with the naked eye. Some topaz has tear-shaped cavities ,containing a gads bubble or several immiscible (non mixing ) liquids . Other inclusions such as cracks ,streaks ,and veils also occur .Prismatic topaz crystals have a characteristic lozenge-shaped cross-section and striations parallel to their length .Topaz has one perfect cleavage .
OCCURRENCE : Topaz occurs in igeneous rocks such as pegmatites ,granites,and volcanic lavas .It may also be found in alluvial deposits as waterworn pebbles .Localities include Brazil , the USA ,Srilanka, Burma the former USSR,Australia ,Tasmania ,Pakistan,Mexico ,Japan, and Africa,Brazi,Pakistan and Russia are sources of pink topaz .
REMARK : In the 17th century the Braganaza diamond (1,640 carats) in the Portuguese crown was thought to be the largest diamond ever found .This was never confirmed and it is now believed to have been a colourless “topaz “ is thought to be derived from the Sanskrit word tapas ,meaning fire .

CHATOYANT

CHATOYANT
The three varieties of quartz described here all have a fibrous structure ,with inclusion of crocidolite that cause a “cat’seye”effect known as chatoyancy . This effect is best seen when the stones are displays different colours according to the exact nature of the inclusion .The greyish yellow,semi translucent appearance of quartz cat’s eye is due to inclusions of crocidolite “asbestos”and less commonly ,hornblende .It has a silky lustre .Tiger’s –eye is black with iron oxide staining that give yellow and golden brown stripes ,Hawk’s-eye form when crocidolite changes to quartz ,but the blue-gray or blue green colour of the original remains .
OCCURRENCE:Quarts cat’s-eye coms from Srilanka ,India and Brazil.The most important source of tiger’s-eye is in South Africa ,where it is found in thack slabs ,togather with the less common hawk’s-eye . Chatoyant quartz is also found in Australia and the USA.

REMARK : Chatoyant quartz is always called quartz cat’s-eye to avoid confusion with other chatoyant gems ,particularly chrysoberyl .

INCLUSIONS
Quartz specimens with mineral in clusion are very common and make gemstones .”Rutilated quartz “or “sagenite “,popularly known as venus –hair stone ,is quartz with needle –like rutile crystals . These may be red,black or brassy yellow ,and have a metallic lustre .”Tourmaline quartz “has inclusions of black tourmaline ,which form prismatic or needle –like crystals .Opaque ,metallic yellow inclusions of gold are found in specimens of “gold quartz “.Inclusions of silver may be found within quartz ,often in branch –like dendrites ,and are silvery grey or black.Opaque and metallic .The iron minerals .geothite and pyrite are also found as inclusions .If cut encabochon ,quartz containing goethite may show the cat’s-eye effect .

OCCURRENCE :Quatrz with inclusions is found in Madagascar ,Brazil ,South Africa ,India ,Srilanka Germany and Switzerland .