Mineral Group · 13 minerals
Tourmaline Group
Minerals
13
Hardness
7-7.5 Mohs
Crystal System
Trigonal
What Defines the Tourmaline Group
Complex borosilicate minerals known for the widest color range of any gem family. The main gem species is elbaite, which produces rubellite (red), indicolite (blue), and verdelite (green). Tourmalines are both pyroelectric and piezoelectric, generating electrical charge from heat and pressure.
Minerals in This Group
Bi-Color Tourmaline
Elbaite with two color zones
Hardness 7.5·Tourmaline Group (Elbaite)
Black Tourmaline
The Shield Stone
Hardness 7·Borosilicate Group
Dravite
The Earthen Tourmaline
Hardness 7.25·Tourmaline Group
Elbaite
The Rainbow Tourmaline
Hardness 7.25·Tourmaline Group
Indicolite
The Blue Tourmaline
Hardness 7.5·Tourmaline Group (Elbaite)
Paraíba Tourmaline
The Neon Gem
Hardness 7.5·Tourmaline Group (Elbaite)
Pink Tourmaline
The Manganese Elbaite
Hardness 7.5·Tourmaline Group
Rubellite
The Red Tourmaline Royalty
Hardness 7.5·Tourmaline Group (Elbaite)
Schorl
The Iron-Black Tourmaline
Hardness 7.25·Tourmaline Group
Tourmalinated Quartz
The Balanced Stone
Hardness 7·Quartz Family
Tourmaline
The Rainbow Stone
Hardness 7.5·Borosilicate Group
Verdelite
The Green Tourmaline
Hardness 7.25·Tourmaline Group
Watermelon Tourmaline
The Dual Heart Stone
Hardness 7·Borosilicate Group