Hackmanite

Mineral Group: Sodalite Group

Key Properties

Property Value
Mohs Hardness 5.75 (5.5-6)
Typical Size 0.5-15 carats (commercial: 1-8 carats; larger clean stones rare)
Typical Price Range $50-500+ per carat (commercial: $100-300; strong tenebrescence $300-500+)
Rarity Level Unique Geological
Availability Level Collectors Market
Availability Driver Limited Deposits
Investment Appropriateness Collector Gems

Pricing

Typical Price
$80.00
per carat
Listing Price
$440.47
per carat
Sold Price
$728.39
per carat
Discount Level
9.1
vs typical

Price Calculator

Estimate Type Total Value Price per Carat
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Detailed Descriptions

Rarity Description: Tenebrescent variety of sodalite that changes color when exposed to UV light. Purple fades to white in sunlight, then returns. Rare phenomenon.

Availability Description: Available through specialty dealers; Afghan and Myanmar material most valued for strong color change; collector phenomenon gem.

Investment Description: Unique tenebrescent property creates collector interest; established niche market; good specimens command premiums; phenomenon more important than size.

NEUTRAL
48.75

Score Components

Geo rarity
85
Mkt availability
85
Invest Appr
0
hardness
5
price
45

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Investment Ranking Calculation

The composite score of 48.75 is calculated using a weighted formula:

  • Geological Rarity (25%): 85 points
  • Market Availability (25%): 85 points
  • Investment Appropriateness (25%): 0 points
  • Hardness (12.5%): 5 points
  • Price Range (12.5%): 45 points

Formula: (85 × 0.25) + (85 × 0.25) + (0 × 0.25) + (5 × 0.125) + (45 × 0.125) = 48.75

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