The Naked Scientists

The Naked Scientists Forum

Author Topic: What is this slate-like rock?  (Read 1547 times)

Offline Tom86

  • First timers
  • *
  • Posts: 1
    • View Profile
What is this slate-like rock?
« on: 29/09/2015 12:51:25 »
Hi everyone,

I've recently returned from a holiday in Mauritius where I found this piece of what I think is slate while walking along the beach on the south west coast.

It has a very shiny, almost a silvery metallic surface which I've not seen on a slate before, and I have not been able to find anything similar while searching on google.

I thought it was man-made at first, but you can see the same metallic colour on all the layers so I guess it must be natural. Someone has suggested that it could be Mica.

Photos:













Hopefully the photos are ok, it is quite difficult to capture the metallic look of it.
« Last Edit: 03/10/2015 07:54:08 by chris »


 

Online Bill S

  • Neilep Level Member
  • ******
  • Posts: 1811
  • Thanked: 11 times
    • View Profile
Re: ID for this slate like rock
« Reply #1 on: 02/10/2015 22:14:43 »
Just from the pics, I would say its a Mica Schist.

The silvery flakes are almost certainly Muscovite Mica.  The darker flecks may be Biotite Mica.  If the colours are true, there is greenish mineral that could be chlorite.
 

Offline Bass

  • Neilep Level Member
  • ******
  • Posts: 1338
  • Thanked: 5 times
    • View Profile
Re: ID for this slate like rock
« Reply #2 on: 03/10/2015 02:28:19 »
BillS has it right. somewhere between phyllite and schist (the difference being that the mica flakes are larger in schist).
 

The Naked Scientists Forum

Re: ID for this slate like rock
« Reply #2 on: 03/10/2015 02:28:19 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums