Allanite Information's

 

Allanite

#Allanite is a rare earth silicate mineral that typically occurs in metamorphic rocks. It was first discovered in 1810.

Chemical Formula

The chemical formula of #Allanite is Ca(Ce,La,Y)2-3Al3(SiO4)3(OH).

Physical Properties

• Color: Brown, greenish-brown, yellow-brown, black
• Crystal System: Monoclinic
• Hardness: 5.5 to 6
• Luster: Vitreous, resinous
• Streak: White to pale brown
• Cleavage: Imperfect
• Fracture: Subconchoidal to uneven
• Tenacity: Brittle
• Specific Gravity: 3.4 to 4.1

Optical Properties

• Refractive Index: 1.712 to 1.784
• Birefringence: 0.070 to 0.080
• Pleochroism: Strong
• Optical Sign: Biaxial (+/-)

Ranking of Rarity

#Allanite is considered a rare mineral.

Occurrence (countries)

#Allanite is found in several countries including:

• Canada
• Greenland
• Norway
• Sweden
• USA

Healing Properties

There are no known healing properties of #Allanite.

Uses

#Allanite is primarily used as an ore of rare earth metals and as a gemstone.