What color is it?: Primarily reddish brown as shown above.
But it can also occur in yellow, blue, violet and grey among other
What is the story behind
this gemstone?: A rare
and unusual gemstone more for collectors than consumers. These
stones will be small and expensive. It is named for the axe shape
of the original crystal formations.
Can I wear it everyday?: You can but probably will not want
Is it expensive?: It can be in large sizes.
Is it a birthstone?: No
What do I need to know before
going shopping?: Plan
on adding to your gem and mineral collection more than your jewelry
ensemble. This will be a difficult stone to find. Although no
collection will be really complete without one.
Source: Mexico, France, and US
a long complicated chemical equation for such a small stone
Formation: Forms in metaphoric rocks whose origins
are calcium rich sedimentary rocks such as limestone
Crystal System: Triclinic
Unusual Properties: None
RI: 1.675 - 1.685
Optic Character: B -
Specific Gravity: 3.27 + -
Transparency: TP - TL
Special Identifying Properties
and Tests: None
Imitations: Many possible but not likely. Confused
with smoky quartz
International School of Gemology.
For the gemological
information on this gemstone we invite you to join us in the