Columbianite A++ 16.2g

Value: 159€

Quantity: 16.2g

Quality: A++

Origin: Atmospheric projectile volcanic eruption (30 mil.)

Hardness: 6 Mohs

Chemical composition: SiO2 + Al2O3

Damage: Undamaged

Locality: Valle del Cauca, Colombia

Dimensions: 2.8cm x 2.5cm x 2.1cm

• 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.