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Columbianite A+ 28.7g
- Value: €373.00
- Quantity: 28.7g
- Quality: A+
- Origin: Atmospheric projectile volcanic eruption (30 mil.)
- Hardness: 6 Mohs
- Chemical composition: SiO2 + Al2O3
- Damage: Undamaged
- Locality: Valle del Cauca, Colombia
- Dimensions: 3cm x 2.9cm x 2.7cm
- 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.
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