Description
Opal Details:
- Variety: Natural Black Opal Type 1
- Body Tone: Black N4 (9)
- Brightness: Bright
- Transparency: Transparent
- Colour: Blue/Green
- Hue: Normal Tones
- Outline: Oval Shape
- Profile: Low Cabochon
- Origin: Lightning Ridge
- Pattern: Mixed Pattern
- Display: Weak or Blank at 1 Angle
- Distribution: Over 80%
- Inclusions: Loupe Visible Only
Physical Properties:
- MOHS Scale: 4.5-6.5
- Polish: 2.15 ± 0.08-0.09
- Refractive Index (R.I.): 1.450 ± 0.020
- Specific Gravity: 1.98 – 2.25
- Carat Weight: 3.69 Carats
- Formula: SiO₂·nH₂O
- Fracture: Conchoidal – Uneven
- Lustre: Vitreous – Resinous
- Fluorescence: May phosphoresce in long/short wave
- Absorption: Spectra 660nm, 470nm
- Category: Mineraloid (Amorphous)
- Crystal Habit: Irregular ‘nodular’ veins
- Composition: Hydrous silicon dioxide (3-21% weight)
- Crystal Form: Amorphous, pseudomorph, botryoidal
Valuation:
- Carat Weight: 3.69 Carats
- Price Per Carat: $247.43
- Total Opal Value: $913.00
Note: As with all natural opals, this gemstone has been photographed in natural light to display its authentic colors and patterns without any digital enhancement.
