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Diopside Rough |
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Gemstone quality diopside is
found in two forms: the
black star diopside and
the chrome diopside
(which includes chromium,
giving it a rich green
colour). At 5.5–6.5 on the
Mohs scale, chrome diopside
is relatively soft to
scratch. Due to the deep
green nature of the gem they
are sometimes referred to as
Siberian emeralds,
though they are on a
mineralogical level
completely unrelated.
Emerald being a precious
stone and diopside being a
semi-precious stone.
Violane is
a manganese-rich variety of
diopside, violet to light
blue in colour. |
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Diopside, Diopside gems,
Diopside rough, Indian
Diopside, chrome Diopside,
faceted Diopside, siberian
Diopside, Russian Diopside,
Diopside beads, Diopside
uncut, Diopside chips,
Diopside jewllery |
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Diopside is a precursor of
chrysotile (white asbestos)
by hydrothermal alteration
and magmatic
differentiation;it can react
with hydrous solutions of
magnesium and chlorine to
yield chrysotile by heating
at 600 °C for three days.
Some vermiculite deposits,
most notably those in Libby,
Montana, are contaminated
with chrysotile (as well as
other forms of asbestos)
that formed from diopside.
At relatively high
temperatures, there is a
miscibility gap between
diopside and pigeonite, and
at lower temperatures,
between diopside and
orthopyroxene. The calcium/(calcium+magnesium+iron)
ratio in diopside that
formed with one of these
other two pyroxenes is
particularly sensitive to
temperature above 900 °C,
and compositions of diopside
in peridotite xenoliths have
been important in
reconstructions of
temperatures in the Earth's
mantle.
Chrome diopside
((Ca,Na,Mg,Fe,Cr)2(Si,Al)2O6)
is a common constituent of
peridotite xenoliths, and
dispersed grains are found
near kimberlite pipes, and
as such are a prospecting
indicator for diamonds.
Occurrences are reported in
Canada, South Africa,
Russia, Brazil, India
and a wide variety of other
locations. In the US,
chromian diopside localities
are described in the
serpentinite belt in
northern California, in
kimberlite in the
Colorado-Wyoming State Line
district, in kimberlite in
the Iron Mountain district,
Wyoming, in lamprophyre at
Cedar Mountain in Wyoming,
and in numerous anthills and
outcrops of the Tertiary
Bishop Conglomerate in the
Green River Basin of
Wyoming. Much chromian
diopside from the Green
River Basin localities and
several of the State Line
Kimberlites have been gem in
character. |
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