Scientifically, specific gravity is defined . This is surprisingly high for a mineral composed of aluminum, silicon, and gaseous elements. Specific gravity : 3.49 - 3.57 Lustre : Vitreous Pleochroism : Distinct to strong (depending on body color) . . But the range is quite wide -- from 8 for cinnabar to 1 for amber. This information can be used to tell whether topaz will float (or sink) if dropped in water (Buoyancy). Topaz sinks in all common heavy liquids while apatite, andalusite, danburite and tourmaline will float in methylene iodide (sg = 3.33). Cleavage cracks, Two-phase inclusions, swirls associated with parallel cleavage. Topaz sinks in all common heavy liquids while apatite, andalusite, danburite and tourmaline will float in methylene iodide (sg = 3.33). Topaz is often . Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al2SiO4 (F,OH) 2. By convention, the temperature of the water is 4 C and at standard atmosphere because the density of water is greatest under these conditions. Topaz, both opaque and translucent, can be yellow, red or orange, blue, brown or even gray, the varieties are enormous. . Specific gravity is technically defined as the ratio obtained by dividing, the weight of a body by the weight of an equal volume of distilled water at a temperature of 4C. It was named after Topasos Island in the Red Sea where it was first discovered. REFRACTIVE INDEX: 1.610-1.630. It is used as a gemstone in jewelry and other adornments. All of them: Color centers, absorption of specific light wavelengths, reflection of specific light wavelengths, and impurities. Diamond, at 3.50 to 3.53, falls approximately in the middle. Gem- ological testing revealed a typical natural topaz: with two-phase inclusions typical of topaz, re- fractive index of 1.61- 1.62, birefringence about 0.009, biaxial-doubly refractive, specific gravity Copal1.06 Amber1.08 Bakelite1.26 Jet1.30 -1.35 (39.2 F.). Sapphire is 9. Lab-created cubic zirconia (CZ) can be used to imitate the appearance of many gemstones. The opal (specific gravity 2.15) will only weigh .61 carats. The Specific Gravity of Gems function provides the specific gravity of various gems and minerals. What is the specific gravity of cement? . . . Colorless topaz is plentiful, and is often treated to give it a blue color. Fermion Index: Fermion Index = 0.0074038512 Boson Index = 0.9925961488 : Photoelectric: PE . Topaz is very hard, but it has a low tenacity, which means it chips and cleaves easily. blue topaz are shown in figure 1. Specific gravity (specific weight) is the ratio of the density of a substance to the density of a reference substance. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow orange. - Precious Stones, Max Bauer, 1968, p 333. For gems the specific gravity reference substance is water. It has a specific gravity of 3.5 and a refractive index of 1.6. The specific gravity (SG) and optics of topaz vary by stone color. Also, if the volume of a given stone can be determined, its topaz weight can be established and tested on a critical scale. Specific gravity: 3.53; Mohs Hardness: 8 Treatments. Topaz is a silicate of aluminum with the presence of fluorine as well. The 16 mineral gemstone groups listed below are highly prized for their beauty . It can be found in huge and flawless crystals, which can be faceted into giant gemstones. Topaz is a hard and durable gemstone, and will not dissolve in most chemical solvents. Minerals with a specific gravity under 2 are considered light, between 2 and 4.5 average, and greater than 4.5 heavy. Specific gravity of cement is 3.15.The specific gravity of cement is 3.15The specific gravity can be found . Topaz has a specific gravity that ranges between 3.4 and 3.6. Specific gravity 3.49 - 3.57. Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al 2 Si O 4 (F,OH) 2. This Topaz gemstone guide lists qualities of the Topaz gem type, including stone colors, common names, meanings, gemstone hardness and more. There are a number of processes used to alter . It is one of the hardest gemstones with a hardness of 8.0 on the Mohs scale of hardness. There are subtle variations to this list. Specific gravity of Topaz =3.55 g/cm 3: Photoelectric: PE Topaz = 1.53 barns/electron U= PE Topaz x Electron density= 5.36 barns/cm 3: Fermion index: Fermion index = 0.0074 Boson index = 0.9925 . Topaz that has undergone this treatment and been turned dark blue is sometimes used as a simulant for aquamarine. Formula. Stability. . You find a clear green gem with a specific gravity of about 4, and a dodecahedron-shaped crystal. Fair. The beautiful Yellow Topaz is a clear and light-yellow colored gemstone. Similarly, glass stones are much lighter than . Physical Properties of Topaz; This high specific gravity causes it to be concentrated into placer deposits by stream currents. Thus the specific gravity of gemstone is the ratio of its density to the density of water. Specific gravity is the number of times heavier a gemstone of any volume is than an equal volume of water; in other words, it is the ratio of the density of the gemstone to the density of water. Mohs scale hardness 8 . The specific gravity of all topaz shades is much heavier than the citrine (about 25% per volume) and this weight difference can be used to separate two stones of equal volume. (3.53) while fluorine raises the specific gravity of topaz (3.56). Specific gravity (also known as "relative density") is the ratio between the weight of a stone in air and the weight of an equal volume in water. FORMATION: Topaz is a fairly common and inexpensive gemstone. The density is expressed as a number which indicates how much heavier the gemstone is compared to an equal volume of water. Most minerals with a metallic luster are heavy. Topaz crystallizes in the orthorhombic system, and its crystals are mostly prismatic terminated by pyramidal and other faces. The specific gravity of topaz is the ratio of the density of topaz to that of a reference substance (Usually water). Shop Natural Zircon Gemstones. Topaz is named from Greek "topazion" for a type of gemstone, probably after Sanskrit "tapas" - fire, alluding to the brilliance of gem-quality material. Topaz 9: Corundum 10: Diamond. SPECIFIC GRAVITY: 2.64 - 2.65. True topaz is correctly labeled and some are preceded by two words - Precious or Imperial. Most gemstone varieties are 2 to 4 times denser than a equal volume of water. Specific gravities are expressed in decimal numbers, for example, 4.00 for corundum, 3.52 for diamond , and 2.72 for quartz. Listing of SG of gems and gem simulants. Topaz actually has an exceptionally wide color range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. Quartz has a Specific Gravity of 2.65 and the Refractive Index of 1.540 to 1.550, whereas topaz has a Specific Gravity of 3,54 and a higher Refractive Index of 1.620 to 1.630. It is measured as the ratio of the density of the gemstone to the density of water, and is expressed as a number that indicates how much heavier the gemstone is compared to an equal volume of water. CompoundAvg. Water has a specific gravity of 1.0. Quartz is 7. the specific gravity of a topaz is 3.4 to 3.6. Topaz (colorless) 3.56 Topaz (yellow) 3.53 . Zircon, one of the densest of all gemstones, may have a specific gravity as high as 4.73! . Therefore, the formula for Specific Gravity is: The gems listed in this utility are: Agate, Alexandrite, Almandite garnet, Amethyst, Andalusite, Aquamarine, Beryl . Optical properties Biaxial. For example, some list a .25 carat diamond as measuring 4.1 mm. in size, were exceptionally dark, fine-quality blue topaz. and 10 cts. The diamond (with a specific gravity of 3.52,) will weigh 1 carat. Specific gravity : 3.49 - 3.57 Lustre : Vitreous Pleochroism : Distinct to strong (depending on body color) . However, since topaz is typically less expensive than aquamarine, consumers should be wary of unscrupulous vendors who may try to . It is one of the hardest naturally occurring minerals (Mohs hardness of 8) and is the hardest of any silicate mineral. If a mineral has a specific gravity of 2.7, it is 2.7 times heavier than water. . lower specific gravity, much lower degree of hardness, and by the entire absence of dichroism. EXAMINATION The two stones, 8 cts. The point is not to take these figures too literally . Inclusions. Topaz is 8. Specific Gravity. Perhaps pink is the rarest version but it is this variety which gives you the chance to select purely on color, perhaps your favorite color. Bulk Density (Electron Density)=3.51 gm/cc note: Specific Gravity of Topaz =3.55 gm/cc. This is most likely a ____. A sapphire (specific gravity 4,) will weigh 1.14 carats. Toughness. Diamond is 10. . The specific gravity may slightly vary within a mineral because . 3.51. Specific gravity: 3.49-3.57: . The following table lists the specific gravity values for a variety of materials commonly found in gem and jewelry collections, as well as for some materials more rarely encountered. 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