Chrysocolla

These copper-containing minerals have blue-to-green color and occur together with other copper minerals, as well as in a disseminated form in chalcedony, opal, and quartz (Webster). Dyeing has been used to enhance the color and to make it resemble turquoise or other gemstones � Nassau (1984) 2 to 4Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 2.00 to 2.45+Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references BrittleMichael O?Donoghue, Gems, Sixth Edition (2006) NoneWalter Schumann, Gemstones of the world (2001) ConchoidalArthur Thomas, Gemstones (2009) 1.460 to 1.570Walter Schumann, Gemstones of the world (2001) More from other references Biaxial/-Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) 0.023 to 0.040Walter Schumann, Gemstones of the world (2001) More from other references AbsentWalter Schumann, Gemstones of the world (2001) More from other references NoneWalter Schumann, Gemstones of the world (2001) Green to blue veins and patchesHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Blue, Cu2+ in octahedral coordinationW. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references Vitreous,WaxyArthur Thomas, Gemstones (2009) NoneWalter Schumann, Gemstones of the world (2001) MonoclinicWalter Schumann, Gemstones of the world (2001) More from other references Compact grape-like aggregates (botryoidal)Walter Schumann, Gemstones of the world (2001) More from other references Common intergrown with chalcedony, malachite and others - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 12 Chrysocolla information at mindat.org Israel  Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 400 Peru  J.Hyrsl (2012) Gemstones of Peru, p. 50 USA  mindat.org