Andalusite
Mineral Group: Andalusite Group
Key Properties
| Property | Value |
|---|---|
| Mohs Hardness | 7.5 (7.5) |
| Typical Size | 1-20 carats (commercial: 2-10 carats; medium sizes most common) |
| Typical Price Range | $50-300 per carat (commercial: $80-200; strong pleochroism desirable) |
| Rarity Level | Limited Occurrence |
| Availability Level | Limited Supply |
| Availability Driver | Limited Deposits |
| Investment Appropriateness | Fashion/Trend Gems |
Detailed Descriptions
Rarity Description: Noted for strong pleochroism; gem-quality stones are limited in supply.
Availability Description: Appears sporadically through faceting-grade suppliers; collector interest centers on pleochroic specimens.
Investment Description: Pleochroism creates collector interest; limited market size; moderate appreciation for finest specimens; fashion-influenced with niche appeal.
Colors
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Investment Ranking Calculation
The composite score of 47.5 is calculated using a weighted formula:
- Geological Rarity (25%): 65 points
- Market Availability (25%): 65 points
- Investment Appropriateness (25%): 25 points
- Hardness (12.5%): 45 points
- Price Range (12.5%): 25 points
Formula: (65 × 0.25) + (65 × 0.25) + (25 × 0.25) + (45 × 0.125) + (25 × 0.125) = 47.5
NEUTRAL
47.5
Score Components
Geo rarity
65
Mkt availability
65
Invest Appr
25
hardness
45
price
25