Date:
Assessor: Australian Opal Cutters
Name: Natural Australian Opal Type 1
Variety: Natural Dark Opal Type 1
Body Tone: Dark NS (9)
Brightness: Brilliant
Transparency: Opaque
Colour: Green-Multi
Hue: Rich Tones
Outline: Oval Shape
Profile: Medium Cabochon
Origin: Lighting Ridge
Pattern: Broad Flash Pattern
Display: Good from All Angles
Distribution: Over 80%
Inclusions: No Inclusions
MOHS Scale: 4,5-6,5
Polish: 2,15+0,08-0,09
REL: 1A50+0,020
Spec Gravity: 1,98 - 2,25
Carat Weight: 10,00 Carats
Formula: Si02nH20
Fracture: Conchoidal - Uneven
Lustre: Vitreous - Resinous
Fluorescence: 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
Located At: Newcastle