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Sphalerite
Sphalerite
☒

Howlite
Howlite
☒



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Sphalerite
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Howlite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.95-4.10
Uneven
{110} Perfect, {110} Perfect, {110} Perfect
3.5-4
(Zn,Fe)SMichael O’Donoghue , Gems, Sixth Edition (2006) More from other references
 
-
-
-
2.45-2.58
Conchoidal
None
3-3.5
Ca 2B 5SiO 9(OH) 5Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references