Columbianite A 349.7g

Value: €1049.00

Quantity: 349.7g

Quality: A

Origin: Atmospheric projectile volcanic eruption (30 mil.)

Hardness: 6 Mohs

Chemical composition: SiO2 + Al2O3

Damage: Small chip

Locality: Valle del Cauca, Colombia

Dimensions: 8.2cm x 7.1cm x 5.3cm

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.