Tourmaline Crystal with Key Mark — Pederneira Mine, Brazil, 7.53 g

A natural tourmaline crystal from Pederneira Mine, Brazil. This slender crystal features a distinctive key mark on its surface. No treatments or repairs have been reported.

• Mineral: Tourmaline
• Origin: Pederneira Mine, Brazil
• Specimen weight: 7.53 g
• Dimensions: 7 × 7.5 × 58.5 mm
• Treatment: Untreated
• Repairs: None
• Notable feature: Key mark

All measurements are approximate.