Mineralpedia Details for Jarlite

Named to honor Carl Frederik Jarl, who was the former President of the Danish Cryolite Company, and was the first to note the mineral. Jarlite can be found in vugs in cryolite deposits along with other fluorides. It occurs only in the Ivigtut Cryolite deposit in the Kitaa Province of Greenland.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/jarlite.pdf

Formula

Na(Sr,Na)₇MgAl₆F₃₂(OH,H₂O)₂ 

Crystal System

Monoclinic 

Crystal Habit

Tabular, Spherical, Massive 

Luster

Vitreous (Glassy) 

Color

colorless, gray white, white 

Streak

white 

Class

Monoclinic - Prismatic 

Fracture

Uneven 

Hardness

4-4.5 

WebMineral

View Jarlite 

Mindat

View Jarlite 

Clear to milky white micro crystals to 0.75mm with somewhat arrowhead-like terminations in sheaf-like bundles.