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Kimberlite With Ilmenite Clinopyroxene Subgroup Phlogopite Olivine & Garnet

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JUB1023557

Kimberlite With Ilmenite Clinopyroxene Subgroup Phlogopite Olivine & Garnet

Rare Mineral

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Description
Locality: 
Monastery Mine, Clocolan, Mofutsanyane District, Free State Province, South Africa
Class: 
Combination
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.2 × 5.6 × 5.4 cm
Weight: 
152.00gr
Description

Kimberlite, a rare variety of peridote, is an igneous rock containing high proportions of olivin and phlogopite. It mostly occurs in vulcanic pipes, structurs formed by the immense power of a eruption, conveying matter with supersonic speed, from very deep origin volcanos, which are at least three times deeper than normal volcanos. These highly seldom events are prone to enable diamonds and xenocrysts. Even though none are visible, this sample could still contain diamonds. The other exhibited structures are numerous cenocrysts and xenoliths. Xenoliths are fragments of older rocks transported into the kimberlite. The much rarer xenocrysts on the other hand, are different types of crystals, formed somewhere else and then transported within flowing lava. The literal greek translation of them would be "alienstone" and "aliencrystal". The multiple xenocrystals visible on this beautiful specimen are hard to classify for sure, but these inclusions could most likely be ilmenite (sparkly, tabular, dark grey crystal blades), clinoproxene (rusty red, amorphic spheres), garnet (shiny, deep red dots) and olivin (shiny, light green cristals).

Mineral Data
What's on the rock

Ilmenite

Formula: 
Fe2+TiO3
Strunz: 
4.CB.05
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
5.0 - 6.0
Type Locality: 
Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia...

Clinopyroxene Subgroup

Group Members: 
Aegirine
Aegirine-augite
Clinoenstatite
Clinoferrosilite
Diopside
Esseneite
Grossmanite
Hedenbergite
Jadeite
Jervisite
Johannsenite
Kanoite
Kosmochlor
Kushiroite
Namansilite
Natalyite
Omphacite
Petedunnite
Pigeonite
Spodumene
Group Parent: 
Pyroxene Group

Phlogopite

Formula: 
KMg3(AlSi3O10)(OH,F)2
Strunz: 
9.EC.20
Crystal System: 
Monoclinic - Prismatic
Hardness: 
2.0 - 3.0
Streak: 
White

Olivine

Synonym Of: 

Olivine Group

Formula: 
(Mg,Fe2+)2SiO4
Group Parent: 
Olivine
Crystal System: 
Orthorhombic
Hardness: 
6.5 - 7
Colour: 
Yellowish green, olive green, greenish black, or reddish brown
Streak: 
White

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