Bastnasite
Mineral Group: Carbonate Group
Key Properties
| Property | Value |
|---|---|
| Mohs Hardness | 4.25 (4-4.5) |
| Typical Size | 0.5-10 carats (commercial: 1-5 carats; faceted stones rare and typically small) |
| Typical Price Range | $50-300 per carat (commercial: $100-200; rare collector stone) |
| Rarity Level | Limited Occurrence |
| Availability Level | Limited Supply |
| Availability Driver | Limited Deposits |
| Investment Appropriateness | Non-Investment Gems |
Detailed Descriptions
Rarity Description: A rare-earth carbonate-fluoride mineral; collectible and not broadly used as gems.
Availability Description: Primarily offered to collectors and museums; not commonly used in mainstream jewelry markets.
Investment Description: Rare earth mineral with limited gem use; very small collector market; no investment potential; primarily mineralogical interest.
Colors
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Investment Ranking Calculation
The composite score of 37.5 is calculated using a weighted formula:
- Geological Rarity (25%): 65 points
- Market Availability (25%): 65 points
- Investment Appropriateness (25%): 5 points
- Hardness (12.5%): 5 points
- Price Range (12.5%): 25 points
Formula: (65 × 0.25) + (65 × 0.25) + (5 × 0.25) + (5 × 0.125) + (25 × 0.125) = 37.5
BEARISH
37.5
Score Components
Geo rarity
65
Mkt availability
65
Invest Appr
5
hardness
5
price
25