Description
Crystal opal is the closest in value and quality to black opal.
Variety: Natural Light Opal Type 1
Body Tone: Light N8 (17)
Brightness: Very Bright
Transparency: Transparent
Colour: Green-Blue
Hue: Normal Tones
Outline: Round
Profle: Medium Cabochon
Origin: Lighting Ridge
Pattern: Named Pattern
Display: Weak or Blank 1 Angle
Distribution: 70 – 79%
Inclusions: 1% of Face
MOHS Scale: 4.5-6.5
Polish: 2.15+0.08-0.09
R.F.I.: 1.450+0.020
Spec Gravity: 1.98 – 2.25
Carat Weight: .52 Carats
Formula: Si02nH20
Fracture: Conchoidal – Uneven
Lustre: Vitreous – Resinous
Flourescence: May phosphoresce in long /short wave
Absorption: Spectra 660nm, 470nm
Category: Mineraloid (Amorphorous)
Crystal Habit: Irregular ‘nodular’ Veins
Composition: Hydroussilicondioxide.3-21%/weight
Crystal Form: Amorphous, pseudomorph, botryoidal
