Description
Opal Details:
- Variety: Natural Dark Opal Type 1
- Body Tone: Black N6 (12)
- Brightness: Slightly Bright
- Transparency: Transparent
- Colour: Green
- Hue: Washed Out Tones
- Outline: Oval Shape
- Profile: Low Cabochon
- Origin: Lightning Ridge
- Pattern: Blocky Pattern
- Display: Weak or Blank from 2 Angles
- Distribution: 60 – 69%
- Inclusions: No Inclusions
Physical Properties:
- Absorption: Spectra 660nm, 470nm
- Birefringence: None
- Category: Mineraloid (Amorphous)
- Cleavage: None
- Crystal Form: Amorphous pseudomorph, botryoidal
- Crystal Habit: Irregular ‘nodular’ veins
- Crystal System: Amorphous
- Composition: Hydrous silicon dioxide (3-21% weight)
- Demand: (1-3)1
- Density: 2.09
- Diapheny: Opaque/translucent/transparent
- Fluorescence: May phosphoresce in long/short wave
- Formula: SiO₂·nH₂O
- Formation: Igneous environments
- Fracture: Conchoidal – Uneven
- Group: Silicates; Tectosilicates; Silica Group
- Lustre: Vitreous – Resinous
- Mohs Scale: 4.5 – 6.5
- Pleochroism: None
- Polish: 2.15 ± 0.08-0.09
- Popularity: (1-4)1
- Prevalence: (1-3)1
- Refractive Index (R.I.): 1.450 ± 0.020
- Specific Gravity: 1.98 – 2.25
- Streak: White
- Solubility: Methanol, Humic, Hydrofluoric Acid
- Transparency: Transparent to opaque
- Tenacity: Brittle
- Type: Igneous, Sedimentary, Metamorphic
Valuation:
- Carat Weight: 5.17 Carats
- Carat Value: $158.36
- Total Stone Value: $818.72
Note:
This opal has been professionally assessed for its authenticity and value. The photos represent the true characteristics of the opal without any digital adjustments.
