Rock Crystal

Cracks are induced (heating and quick cooling) then dyed in any color, magnification: web-like network. Iris, rainbow quartz have iridescence due to cracks. Coated (all colors) with ultra-thin layer of metallic elements (gold for light blue "Aquaaura"), color concentration along facet junctions or irregular distribution, peeled coating. Sharp blade, acetone, acid tests - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7 Imitations made of quartz triplets are common - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7 Synthetic rock crystal is used only for industrial purposes. - Gemstones of the world, Walter Schumann, 2001, p 116 7Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) 2.65Walter Schumann, Gemstones of the world (2001) More from other references BrittleWalter Schumann, Gemstones of the world (2001) Very brittle NoneWalter Schumann, Gemstones of the world (2001) ConchoidalWalter Schumann, Gemstones of the world (2001) 1.544 to 1.553Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Uniaxial/+Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) 0.009Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) AbsentWalter Schumann, Gemstones of the world (2001) 0.013Walter Schumann, Gemstones of the world (2001) Star 4/6/12 (rare)Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) ColorlessHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references TransparentWalter Schumann, Gemstones of the world (2001) More from other references VitreousWalter Schumann, Gemstones of the world (2001) NoneWalter Schumann, Gemstones of the world (2001) TrigonalHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Hexagonal prismsWalter Schumann, Gemstones of the world (2001) Rock crystal is found widespread in the world.Michael O?Donoghue, Gems, Sixth Edition (2006) Huge variety of inclusions such as 2 phase inclusions, golden rutile needles ("Venus hair"), black tourmaline crystals, fibers of green actinolite, mossy-like green chlorite, dark red hematite - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7 Rock Crystal information at mindat.org Myanmar  Kammerling et al. (1994) Peru  Sri Lanka