Serpentine Group

Jun 28th, 2015
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Relief - low 2. Colour - green, yellow, red-brown, 3. RI - 1.532-1.574 4. Birefringence - 0.004-0.017 5. Interference colours - first order

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Serpentine GroupClay Minerals Grouptrigonal, monoclinic, orthorhombic (-)Relief - lowColour - green, yellow, red-brown,RI - 1.532-1.574Birefringence - 0.004-0.017Interference colours - first orderpartial alteration to serpentine group minerals of olivinePPLdunitepartial alteration to serpentine group minerals of olivine, the crystal above in crossed polars.XPLduniteolivine crystal completely altered to serpentine group minerals, poikilitically enclosed by an unlatered clinopyroxene.XPLperidotiteenlarged view of an olivine crystal undergoing alteration to serpentine along fractures.PPLperidotiterelict olivine crystals in a serpentinitePPLperidotiterelict olivine crystals in a serpentiniteXPLperidotiteTotally serpentinised peridotite. Pseudomorphs of olivuine are visible and asbestiform crystals of the serpentine mineral chrysotile occupy the centre of the fiel of view. Red-brown and opaque material is the iron-rich clay mixture iddingsite. The green material may be bowlingite (chlorite-rich).PPLserpentinite

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