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Kumdy Kol area, Kokchetav Massif, Kökshetaü Oblysy (Kokshatau [Kokchetav] Oblast'), Kazakhstan

The first occurrence of metamorphic diamond.

UHP dolomite marbles and pelitic gneisses (subduction zone : 250 km deep).
Three types of marbles are known : diamond-bearing dolomite marbles, Ti-clinohumite-bearing dolomitic marbles and titanite-bearing calcite marbles.

Presence of lamproites.

In pelitic gneisses, diamonds formed from carbon dissolved into aqueous fluids.
In marbles, diamond precipitated from fluids (C-O-H).





Mineral List:
'Apatite'
Aragonite
Biotite
Calcite
var: Mg-rich Calcite
Clinochlore
Clinohumite
var: Titanclinohumite

'Clinopyroxene Subgroup'
Coesite
Diamond
Diopside
Dolomite
Forsterite
'Garnet Group'
Graphite
'K Feldspar'
Kokchetavite (TL)
Kumdykolite (TL)
Kyanite
Magnesite
Majorite
Phengite
Phlogopite
Pyrope
Quartz
Spinel
Titanite
'Tourmaline'
Tremolite
Zircon
Zoisite


31 entries listed. 22 valid minerals. 2 type localities (valid minerals).

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