Schorl (Tourmaline Group)

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS1507
Price: 20.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS1508
Price: 19.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS4777
Price: 22.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS5353
Price: 15.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS5426
Price: 15.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS5441
Price: 15.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS5442
Price: 15.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS5443
Price: 15.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS5444
Price: 15.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS5054
Price: 9.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS5055
Price: 14.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS5033
Price: 9.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS5034
Price: 15.00 EUR 

Tourmaline


Bobrůvka, Moravia, Czech Republic

Item-No.: MINS5035
Price: 15.00 EUR 

Tourmaline


Smolné Pece, Potůčky, Karlovy Vary Region, Czech Republik

Item-No.: MINS4776
Price: 45.00 EUR 

Synonyms:  Afrisite, Cockle, Iron Tourmaline, Schirl, Shirl, Shorl
Classification:  Silicates, Cyclosilicates, Tourmaline Group
Chemical formula:  Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Crystal system:  Trigonal
Density (g/cm3):  3.18 - 3.22 measured, 3.244 calculated
Tenacity:  Brittle
Cleavage:  Very poor on vertical C axis
Fracture:  Irregular, uneven, Sub-conchoidal
Hardness (Mohs):  7 - 7.5
Colour:  Bluish-black to black, sometimes brownish-black, rarely greenish-black
Lustre:  Vitreous, Resinous
Streak:  Greyish-white to bluish-white
Transparency:  Translucent, opaque
Co-type locality:  Zschorlau, Schneeberg, Ore Mountains, Saxony, Germany