Description
- Variety: Natural Dark Opal Type 1
- Body Tone: Dark N5 (10)
- Brightness: Slightly Bright
- Transparency: Opaque
- Colour: Multicolour with normal tones
- Shape: Oval Outline
- Profile: Low Cabochon
- Pattern: Mixed Pattern
- Display: Weak or blank from one angle
- Colour Distribution: Over 80% coverage
- Inclusions: Visible only under a loupe
- Physical Properties:
- MOHS Scale: 4.5 – 6.5
- Polish: 2.15 ± 0.08-0.09
- Refractive Index (R.I.): 4.450 ± 0.020
- Specific Gravity: 1.98 – 2.25
- Carat Weight: 2.80 Carats
- Formula: SiO₂nH₂O
- Fracture: Conchoidal – Uneven
- Lustre: Vitreous to Resinous
- Fluorescence: May phosphoresce under long/short wave UV
- Absorption Spectra: 669nm, 470nm
- Category: Mineraloid (Amorphous)
- Crystal Habit: Irregular ‘nodular’ veins
- Composition: Hydrous silicon dioxide (3-21% water content)
- Crystal Form: Amorphous, pseudomorph, botryoidal
This opal is valued at $410 per carat, with a total value of $647.80, making it an extraordinary choice for collectors, jewelry enthusiasts, and gemstone aficionados.
