General Information |
---|
A variety or type of: | Tourmaline |
---|
Chemical Formula | Na(Li | | Al | | )Al | | (Si | | O | | )(BO | | ) | | (OH) | | (OH) | Gemdat.org, Management Team (2012) More from other references |
---|
Indicolite Treatments |
---|
Routinely heat-treated to lighten the color - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 5 |
Physical Properties of Indicolite |
---|
Mohs Hardness | 7 to 7.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
---|
Specific Gravity | 3.05 to 3.11Michael O’Donoghue, Gems, Sixth Edition (2006) |
---|
Tenacity | BrittleMichael O’Donoghue, Gems, Sixth Edition (2006) |
---|
Cleavage Quality | PoorMichael O’Donoghue, Gems, Sixth Edition (2006) |
---|
Optical Properties of Indicolite |
---|
Refractive Index | 1.614 to 1.666Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
---|
Optical Character | Uniaxial/-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
---|
Birefringence | 0.014 to 0.040Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
---|
Pleochroism | Strong: dark blue - light blueWalter Schumann, Gemstones of the world (2001) |
---|
Dispersion | 0.017Walter Schumann, Gemstones of the world (2001) |
---|
Colour |
---|
Colour (General) | (Dark)-blueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
---|
Causes of Colour | Blue, Fe2+ in octahedral coordination with possible influense of some iron related transfer processesW. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) |
---|
Transparency | Transparent,Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
---|
Lustre | VitreousArthur Thomas, Gemstones (2009) |
---|
Fluorescence & other light emissions |
---|
Fluorescence (General) | Weak or noneWalter Schumann, Gemstones of the world (2001) |
---|
Crystallography of Indicolite |
---|
Crystal System | TrigonalHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
---|
Habit | Prismatic to acicular crystalsMichael O’Donoghue, Gems, Sixth Edition (2006) |
Further Information |
---|
Mineral information: | Indicolite information at mindat.org |
---|
Significant Gem Localities |
---|
| Afghanistan | |
| Bowersox and Chamberlin (1995) |
| Bowersox and Chamberlin (1995) |
| Glas (2002) |
| Glas (2002) | | Brazil | |
| Cassedanne and Roditi (1996) |
| Cassedanne and Roditi (1996) |
| Cassedanne and Roditi (1996) |
| Menezes (2009) | | Mozambique | |
| Henn and Bank (1997) |
| Henn and Bank (1997) |
| Schafer and Arlt (2000) | | Namibia | |
| Schneider and Seeger (1992) |
| Mossman (2002) |
| Schneider and Seeger (1992) | | Pakistan | |
| Laurs et al. (1998) | | Sri Lanka | |
| | | USA | |
- Mesa Grande Mining District
| Fisher et al. (1999) |
- Tourmaline Queen Mountain (Pala Mtn; Queen Mtn)
| Fisher et al. (1999) |
| Jahns, R. H. and Wright, L. A. 1951. Gem and Lithium-bearing pegmatites of the Pala District, San Diego County, California. California Division of Mines special report 7A. |
- Warner Springs Mining District
| Laurs (2001, 2002, 2004) |
| Freeman (2005) |
|
|