anthophyllite
(amphibole - group)
Mineral Class: Silicates
Crystal System: Orthorombisk
Chemical formula: (Mg, Fe)
7 Si8O22 (OH)
2
Mohs hardness: 6
Density: Approximately
6
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Nuummit is a gem from the rhombic amphibole anthophyllite (Magnesium)
with Gedrit (aluminum).
Colors due
to adhesions of
the two minerals, where
the transition gives a
special reflex pattern in
yellow, maroon,gray,
light green and light
blue.
The rock is a metamorft conversion
of old volcanic
rocks and
are considered to
be the oldest crystallized minerals.(About
3 billion).
Nuummit well
suited for
the manufacture of gemstones,
carvings, etc. And
is now well
known worldwide.
There are similar minerals from elsewhere
in the world,
which unfortunately will
be marketed under
the nameNuummit. This
is obviously not correct
because Nuummit is named
after the
capital, Nuuk
in Greenland,
where the
stone is
collected in
the mountains around
Nuuk fjord.
And therefore
it is only anthophyllite with Gedrit coming
from that
site as may be
described as Nuummit. |