Rhodonite

May be dyed: acetone test - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 3 5.5 to 6.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 3.40 to 3.76Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references PerfectUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references ConchoidalArthur Thomas, Gemstones (2009) 1.711 to 1.752Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Biaxial/+Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 0.010 to 0.014Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Distinct: yellowish-red - pinkish-red - yellowish-redHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references NoneWalter Schumann, Gemstones of the world (2001) Red, gray-red - (opaque); red, orange-red (transparent)Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references Pink, Mn2+ in octahedral coordination, with minor Fe2+. Mn3+ in octahedral coordinationW. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Vitreous,Dull (Earthy)Arthur Thomas, Gemstones (2009) InertHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) TriclinicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Commonly tabular or cleavable masses.Michael O?Donoghue, Gems, Sixth Edition (2006) More from other references Rhodonite occurs in manganese deposits formed by hydrothermal contact and regional metamorphism.Michael O?Donoghue, Gems, Sixth Edition (2006) Rhodonite information at mindat.org Australia  Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 444 Brazil  Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 444 Peru  Russia  Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 444 Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 443 USA  MacFall, 1951. Gem Hunter's Guide, 1st ed.; Bradley, W.W. (1936), Thirty-second report of the State Mineralogist: California Division Mines Report 32: 217; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 323.