Danu Group

Zircon  is nesosilicates group mineral. Its corresponding chemical formula is  ZrSiO4 . The name derives from the Persian zargun, meaning "gold-hued". Zircon is a popular gemstone that has been used for nearly 2000 years. The crystal structure of zircon is a tetragonal crystal system with 7.5 hardness according to the Mohs Hardness scale. Zircon is also very resistant to heat and corrosion and known as Insoluble gemstone . This Uniaxial (+) mineral Specific gravity is 4.6–4.7. It's heavy more than such as Sapphire , chrysoberyl , Garnet , spinel . Gem Businessmen use these physical properties to identify zircons from other gemstones . Zircon has weak pleochroism and has colours such as Colorless , Very Strong Blue To Green-Blue, Yellow , Blue-Green , Yellowish Green , Yellow-Green, Brown , Orangy Yellow To Reddish Orange, Dark Brownish Red, Sometimes Purple, Gray To Bluish Gray, Brownish Gray. Colourless specime...

Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al ₂SiO₄( F , OH)₂. Topaz is found colours such as colourless , blue , brown, orange, grey, yellow, green, pink and reddish-pink. Orangy-Pink and bright yellow to deep golden brown hue topaz are known as Imperial Topaz . Naturally occurring blue topaz is quite rare. Typically, colourless, grey or pale yellow and bright blue stones are heat-treated and irradiated to get a good blue colour. Topaz crystallizes in the orthorhombic system , and its crystals are mostly prismatic terminated by pyramidal and other faces. It occurs in pegmatites and high-temperature quartz veins, also in cavities in granites and rhyolites. Topaz can be found in Sri Lanka , Afghanistan , Algeria , Argentina , Australia , USA , Austria , Bolivia , Canada , Czech Republic , Denmark , Canada , Egypt , Ethiopia , Finland , Europe , France , Germany , Greece , Guyana , Hungary , Irela...

Trigon Δ 😘 Fresh from the mineral ® 🇱🇰 CEYLON Natural spinel Crystal with trigon Dimension : 7.5 x 6.1 x 5.3 mm Location : city of gem Ratnapura, Sri Lanka Spinel is the magnesium - aluminum member of the larger spinel group of minerals with chemical formula MgAl₂O₄ . Spinel is actually a large group of minerals. Gahnite , hercynite , ceylonite , picotite, and galaxite are all part of the spinel group. This oxide mineral is a Cubic crystal system with 7.5–8.0 hardness according to the Mohs hardness scale. Spinels Specific Gravity is depending on the composition of chemicals such as Zn -rich spinel can be as high as 4.40, otherwise, it averages from 3.58 to 3.61. Spinel has many colours such as red , pink , blue , lavender / violet , dark green , brown , black , colourless , grey . Spinel is a single reflective Non- pleochroic gemstone and Anomalous in some blue zincian varieties. It can be found as Opaque, Translucent or t...

Spinel is the magnesium - aluminum member of the larger spinel group of minerals with chemical formula MgAl₂O₄ . Spinel is actually a large group of minerals. Gahnite , hercynite , ceylonite , picotite, and galaxite are all part of the spinel group. This oxide mineral is a Cubic crystal system with 7.5–8.0 hardness according to the Mohs hardness scale. Spinels Specific Gravity is depending on the composition of chemicals such as Zn -rich spinel can be as high as 4.40, otherwise, it averages from 3.58 to 3.61. Spinel has many colours such as red , pink , blue , lavender / violet , dark green , brown , black , colourless , grey . Spinel is a single reflective Non- pleochroic gemstone and Anomalous in some blue zincian varieties. It can be found as Opaque, Translucent or transparent. Spinel RI value is n = 1.719 Some red and pink spinels have fluorescence under UV Light . also, Some spinels have magnetism Weak to medium. Natural spine...