Dravite and Herderite Physical Properties

Dravite

Herderite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.03-3.182.90-3.02

1 7.18

1.5 Fracture

Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

1.6 Cleavage

{???} Indistinct

Indistinct on {110}

1.7 Mohs Hardness

7-7.55-5.5

2 10

1.8 Chemical Composition

Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

CaBePO 4(F,OH)Ulrich Henn and Claudio C.

Dravite and Herderite Chemical Formula

While comparing Dravite and Herderite 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 Dravite and Herderite chemical formula.

Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Chemical formula of Herderite- CaBePO 4(F,OH)Ulrich Henn and Claudio C.

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Dravite and Herderite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Dravite and Herderite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Herderite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 2.90-3.02 whereas that of Herderite is 2.90-3.02.