Staurolite Details

 

Staurolite Information

Group:

Staurolite belongs to the group of nesosilicates.

Chemical Formula:

The chemical formula of staurolite is Fe2Al9Si4O22(OH)2.

Discovery:

Staurolite was first discovered in the mid-19th century in the United States.

Physical Properties:

• Color: brown, black, red-brown.
• Hardness: 7 - 7.5 on the Mohs scale.
• Luster: vitreous to resinous.
• Streak: white to gray.
• Diaphaneity: transparent to opaque.

Optical Properties:

• Refractive Index: nα = 1.734 - 1.743, nβ = 1.736 - 1.745, nγ = 1.747 - 1.757
• Birefringence: δ = 0.013 - 0.014
• Optical Character: biaxial positive

Ranking of Rarity:

Staurolite is not a rare mineral.

Occurrence (Countries):

Staurolite is found in various countries such as the United States, Russia, France, Spain, and Switzerland.

Healing Properties:

• Staurolite is believed to be a grounding stone that can help with emotional balance and stability.
• It is also said to aid in healing of physical ailments such as muscle tension and joint pain.

Uses:

• Staurolite is used as an abrasive due to its hardness.
• It is also used as a gemstone and for decorative purposes.