Columbianite A 15.2g

Value: €133

Quantity: 15.2g

Quality: A

Origin: Atmospheric projectile volcanic eruption (30 mil.)

Hardness: 6 Mohs

Chemical composition: SiO2 + Al2O3

Damage: 2x micro chip

Locality: Valle del Cauca, Colombia

Dimensions: 2.6cm x 2.5cm x 2.3cm

• A quality - prime specimens in terms of morphology, color, and light reflection.
• B quality – medium grade specimens.
• C quality - specimens with basic morphology, color, and light reflection.
• An additional plus stands for morphological beauty (+), color (+), or sunlight reflection (+).

• Undamaged - the specimen is faultless.
• Micro chip - minor surface damage from 1mm to 4mm.
• Small chip - minor surface damage from 4 mm to 8 mm.
• Large chip - surface damage from 8 mm to 12 mm.
• Big chip - surface damage over 12mm.