Schorl and Alexandrite Physical Properties

Schorl

Alexandrite

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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

3.18-3.22

3.69-3.81

1.5 Fracture

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

Not Available

1.6 Cleavage

{1011} Indistinct

1,1 ; 3,2.

1.7 Mohs Hardness

Not Available

8.5

1.8 Chemical Composition

Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

BeAl ₂ O ₄

Schorl and Alexandrite Chemical Formula

While comparing Schorl and Alexandrite 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 Schorl and Alexandrite chemical formula.

Chemical formula of Schorl- Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Chemical formula of Alexandrite- BeAl ₂ O ₄

Compare Black Gemstones

Schorl Vs Snowflake Obsidian

Schorl Vs Xenotime

Schorl Vs Triplite

Schorl and Alexandrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Schorl and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Schorl and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Schorl is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.