Staurolite twins specimen from Russia (210)

Stavrolite is a rare mineral known for its characteristic cross—shaped twins, which arise due to its unique crystal structure. Samples with doubles at an angle of 90 ° are especially appreciated by collectors, as they are extremely rare. This specimen comes from Keiva, Semiostrovye, a famous deposit where exceptional quality stavrolites are found.

Formula:
Fe$_2$Al$_9$(Si$_4$O$_{22}$)(O,OH)$_2$

Dimensions: 26*14*6 mm

Origin: Russia, Keivy, Semiostrovye