Space/Science » in reply to porphyritic basalt

re: porphyritic basalt

Nick Hoffman — 1/1/2005 6:14:59 AM (archived)

Thanks,

I missed staurolite!

I like your call of altered olivine. Looking at the un-Ratted surface I believe that I see the same wedge / keyhole / arrow shaped features as the "smooth" phenocrysts, but on the surface they're weathering out.

Edge enhancement was interesting - seemed to show about 3 different types of phenocryst -

1) 1-3 mm "arrows" or hexagons - dark grey smooth surface - Certainly Mafic
2) 1-3 mm housebrick or tile shaped mid-grey crystals/laths (in a basalt these would be feldspar laths?)
3) 0.3-1 mm Light coloured equant grains (a second feldspar phase? - Plagioclase)

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The whole thread (59 posts)

• Smooth inclusions in Wishstone rock. - Robert Clark - 12/31/2004 3:26:56 PM
  • Squires on Wishstone - jms - 1/4/2005 4:41:27 PM
    • Mineral Sands - Nick Hoffman - 1/4/2005 8:57:14 PM
      • re: Mineral Sands - jms - 1/4/2005 10:24:15 PM
        • Looking who I'm telling 'bout carbonatites! - jms - 1/5/2005 3:01:05 AM
          • Wishstone almost certainly igneous - Simon - 1/6/2005 2:55:01 AM
  • UPDATE: Wishstone Rich in Phosphorus - jms - 1/3/2005 11:14:19 PM
    • Phosphorus and clays. - Robert Clark - 1/5/2005 2:55:02 PM
      • re: Phosphorus and clays. - Robert Clark - 1/5/2005 10:24:21 PM
        • Superresolution. - Robert Clark - 1/8/2005 12:13:20 AM
        • Brushed and RATTed area. - Robert Clark - 1/6/2005 11:11:17 PM
        • Resolution and focus - Nick Hoffman - 1/6/2005 1:27:46 PM
        • Only if it is magnetic - jms - 1/5/2005 11:20:44 PM
    • Minor correction: - jms - 1/3/2005 11:39:09 PM
      • Another Minor correction: - jms - 1/4/2005 3:38:09 PM
      • re: Minor correction: - Nick Hoffman - 1/4/2005 10:06:09 AM
        • good point. (n/t) - jms - 1/4/2005 3:38:57 PM
  • re: Smooth inclusions in Wishstone rock. - Nick Hoffman - 1/1/2005 3:27:33 AM
    • Non-crystalline material? - Robert Clark - 1/1/2005 1:19:32 PM
      • re: Non-crystalline material? - Nick Hoffman - 1/2/2005 3:52:07 AM
        • re: Non-crystalline material? - Robert Clark - 1/2/2005 4:16:22 AM
          • Oh, I see... - Nick Hoffman - 1/2/2005 4:34:14 AM
            • What the hell is wrong with you?! - R.L. (THE SUPREMELY TOLERANT) - 1/2/2005 10:11:39 PM
              • :-) - Nick Hoffman - 1/3/2005 2:24:53 AM
              • Gee, that post may have seemed a little angry - R.L. - 1/3/2005 12:13:03 AM
                • re: Kermit the Mars Frog! - kook - 1/3/2005 12:45:27 AM
            • Rounded forms. - Robert Clark - 1/2/2005 2:29:07 PM
              • re: Fossilized forms. - crank - 1/2/2005 3:57:53 PM
              • psuedomorphs - jms - 1/2/2005 3:51:13 PM
                • Thanks for the links. (n/t) - Robert Clark - 1/3/2005 5:29:09 AM
    • porphyritic basalt - jms - 1/1/2005 5:48:11 AM
      • re: porphyritic basalt - Nick Hoffman - 1/1/2005 6:14:59 AM
        • modification: Porphyritic Andesite? - jms - 1/1/2005 7:00:22 PM
          • see andesite image - Philip Simon - 1/4/2005 6:56:36 AM
            • re: Excuse me, pardon me. - crank - 1/4/2005 4:40:04 PM
              • Sure, but please elaborate your theory! - Simon - 1/6/2005 2:25:05 AM
                • re: Sure, but please elaborate your theory! - crank - 1/7/2005 2:24:10 PM
              • re: Excuse me, pardon me. - Nick Hoffman - 1/4/2005 8:59:06 PM
                • re: Excuse me, pardon me. - ashley napier ,13 - 7/17/2005 12:34:50 AM
                • re: Excuse me, pardon me. - crank - 1/4/2005 9:49:46 PM
                  • re: Correction - crank - 1/4/2005 10:29:11 PM
                    • Depletions - jms - 1/4/2005 10:57:03 PM
                      • re: Depletions - crank - 1/4/2005 11:13:04 PM
                        • No conspiracy - jms - 1/5/2005 3:03:38 PM
                          • re: No logic - crank - 1/5/2005 3:50:48 PM
                            • geo logic - jms - 1/5/2005 6:42:23 PM
                              • re: geo logic - kook - 1/5/2005 7:02:39 PM
                                • Lot's o' rocks there. - jms - 1/5/2005 9:34:45 PM
                                  • re: Lot's o' kooks here. - kook - 1/5/2005 10:55:09 PM
                                    • The post I was hoping for: - jms - 1/6/2005 10:38:59 PM
                                      • re: The post I was hoping for: - Robert Clark - 1/7/2005 1:17:27 PM
                                      • Impressive example. - Tom Brosz - 1/6/2005 11:42:52 PM
                                        • re: Impressive anomalies. - crank - 1/7/2005 1:27:10 AM
                                    • Specifying the rock. - Robert Clark - 1/6/2005 6:17:55 AM
                                      • re: Specifying the rock. - Nick Hoffman - 1/6/2005 1:30:01 PM
                                    • Lot's o' boring kooks here. (n/t) - jms - 1/6/2005 1:02:40 AM
            • nice picture, thanks - jms - 1/4/2005 3:53:44 PM
              • re: nice picture, thanks - Robert Clark - 1/4/2005 5:15:26 PM
          • Agree N/T - Nick Hoffman - 1/2/2005 3:55:19 AM