Danu Group

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...

Garnets are a group of silicate minerals . All species of garnets possess similar physical properties and crystal forms but differ in chemical composition Such as Pyrope Mg3Al2Si3O12, Almandine Fe3Al2Si3O12, Spessartine Mn3Al2Si3O12, Andradite Ca3Fe2Si3O12, Grossular Ca3Al2Si3O12, Uvarovite Ca3Cr2Si3O12. Most Garnets have a variable magnetic attraction. This characteristic also uses to identify garnet . Pyrope - almandine - spessartine and uvarovite - grossular - andradite is two solid solution series of garnets . This nesosilicates mineral Specific gravity is 3.1–4.3 with 6.5–7.5 hardness according to the Mohs hardness scale . Garnets don't have Pleochroism , It's a single Reflective Stone in gemstone families. Garnet has many kinds of colour such as Red, Purple, Green, Yellow, Orange , pink , Colour Change, Blue , Brown , Black, Colourless. Blue Garnet is very rare. Also, Garnet can be found with the star effect because of we...