Discovery of Pyrope Spessartite garnets ( Madagascar )

Written by Alain Darbellay GGGems


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At this time startedrepparttar orange garnet's fever. The stone did not show almost any more change, its champagne-orange color atrepparttar 109297 day was simply reinforced in a vivid orange or for other elements in an orange-red under electric light. This type of garnet is a pyrope-spessartite also containing vanadium and chromium traces. Onrepparttar 109298 totality of Malaya extracted, a small part was pure, but much showed typical inclusions of this stone. Initially networks of rutile needles and strain patterns were often present, and inclusions of graphite accompanied them. Negative crystals and, quartz, apatite, monazite and zircon had been also invited duringrepparttar 109299 growth ofrepparttar 109300 precious malaya garnet. Hererepparttar 109301 first pyrope-spessartite cut in 1998. Realized in an arid landscape composed of bushes and cactus, this discovery remains exceptional by repparttar 109302 quality of its product and also byrepparttar 109303 fact that it wasrepparttar 109304 second deposit inrepparttar 109305 world to deliver this type of Malaya garnet.

Here, one ofrepparttar 109306 only intact garnets found inrepparttar 109307 occurrence. Its unusual stacking shape must be noticed. Refractive Index: 1.73 - 1.81 Chemical Composition: [Mg3 + Mn3]AL2(SIO4) Hardness: 7 - 7.5 Density: 3.65 - 4.20 Crystal Group: Cubic Above,repparttar 109308 only phlogopite mica found inrepparttar 109309 neighborhood ofrepparttar 109310 deposit at that time, it is still in its gangue. Of transparent quality, it shows a similar color to that of malaya garnets. ¶ Garnet data ¶ Madagascar Gem Safari ¶ Malaya garnet Catalog ¶

Allrepparttar 109311 pictures on this site have been shot by gggems.com Alain Darbellay

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Madagascar corundums ( Sapphire & Ruby discovery )

Written by Alain Darbellay GGGems


Continued from page 1
Ruby in amphibolite. The crystals engaged in rocks, rich in mica have rough faces, encrusted of biotite or muscovite, minerals which also exist atrepparttar state of inclusions, associated with magnetite and pyrite. Because of its hardness, its inalterability and its density, corundum constitutes a standard mineral of alluvia. Ruby Giant Sapphire in a metamorphic dolomitic limestone. Polychrome Sapphire Blue Sapphire ( origin: Blue Sapphire ( origin: Ilakaka 1999 ) ( origin: Iankaroka 1990 ) Andranondambo 1992 ) Found inrepparttar 109296 sandstones of Isalo in This sapphire comes from a granit, The stone comes from alluvium,repparttar 109297 shape is rounded. its shape is intact. a metamorphized limestone. The origin ofrepparttar 109298 stone is a limestone. ∑ The structure of crystals. It is R.J.HaŁy who put forthrepparttar 109299 first assumption, confirmed 200 years later, onrepparttar 109300 structure ofrepparttar 109301 crystallized material. He lets drop accidentally a calcite crystal which broke into small rhomboedrons. He supposed whereas repparttar 109302 crystals were consisted of stacking small rhomboedrons elementary (that he calledrepparttar 109303 "integral molecule"), he could reconstitute all known shapes of calcite. In a crystal lattice, three atoms or groups of atoms (nodes), which is not onrepparttar 109304 same line, determine a plan called reticular plan. But there is a great number of these plans: it is enough to choose nodes not strictly nearby. Asrepparttar 109305 network is infinite, there is even an infinity of possible plans. The dimension ofrepparttar 109306 faces does not play of role. Inrepparttar 109307 course of growth, a face can develop more quickly than another. The angle thatrepparttar 109308 faces make between them remains constant, since it depend onrepparttar 109309 network. This structure ofrepparttar 109310 crystalline material explainsrepparttar 109311 law ofrepparttar 109312 constancy ofrepparttar 109313 dihedral angles. Triangular figure on a Scratches on a rare Stacking in macle Triangles on a translucent colorless corundum. colorless corundum. of a ruby. corundum. Triangular figure on a Triangles in step on a blue Remarkable macle of blue corundum. corundum from Maromby. red corundum. Sapphire & Ruby Safari Gem ruby from Ambatovaravarana. The alluvial ruby deposit of Ambatovaravarana inrepparttar 109314 high plateaus, is inrepparttar 109315 left center onrepparttar 109316 picture, underrepparttar 109317 hill.

Macle of blue sapphire. Macle of ruby 60 grms. Information ¶ Cutting Styles ¶ Characteristics ¶ Crystalline Systems ¶ Madagascar Sapphire Andranondambo Sapphires ¶ Blue Sapphire Crystal ¶ Ruby Crystal ¶ Sapphire Slice Your guide to GGGems.com Allrepparttar 109318 pictures on this site have been shot by gggems.com Alain Darbellay

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