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Sillimanite
Sillimanite
☒

Natrolite
Natrolite
☒



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Sillimanite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
 
Brittle
-
-
2.20-2.26
Uneven
Perfect on {110}
5-5.5
Na 2[Al 2Si 3O 10] · 2H 2OMichael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Compare Blue Gemstones

Blue Gemstones

Violane
Violane
Vivianite
Vivianite
Wardite
Wardite
Natrolite
Star Sapphire
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Natrolite Vs Starlite
Natrolite
Strontium Titanate
Natrolite Vs Strontium Titanate

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