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Anhydrite
Anhydrite

Siderite
Siderite



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Anhydrite
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Anhydrite and Siderite Physical Properties

1 Physical Properties
1.1 Tenacity
Brittle
Brittle
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.90-2.98
3.83-3.89
1.5 Fracture
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Conchoidal, UnevenArthur Thomas, Brittle
1.6 Cleavage
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Perfect on {01 1 1}
1.7 Mohs Hardness
3.5
3.5-4.5
1.8 Chemical Composition
CaSO 4Michael O’Donoghue , Gems, Sixth edition (2006) More from other references
Fe2+ CO 3Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Anhydrite and Siderite Chemical Formula

While comparing Anhydrite and Siderite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Anhydrite and Siderite chemical formula.

  • Chemical formula of Anhydrite- CaSO 4Michael O’Donoghue , Gems, Sixth edition (2006) More from other references
  • Chemical formula of Siderite- Fe2+ CO 3Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Anhydrite and Siderite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Anhydrite and Siderite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Anhydrite and Siderite Optical Properties during the identification of gemstone. Specific gravity of Anhydrite is 3.83-3.89 whereas that of Siderite is 3.83-3.89.