Datolite

Bor Pit, Dalnegorsk B deposit, Dalnegorsk, Dalnegorsk Urban District, Primorsky Krai  Russia

Specimen size: 3.7 × 1.9 × 1.9 cm = 1.46” × 0.75” × 0.75”
Main crystal size: 2.4 × 2 cm = 0.94” × 0.79”