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GeneralFeldspar Twins and hoppered Albites
31st Jul 2019 20:58 UTCEch Noch
Here is the first plate, between the Twins (which are tapered inward toward their bases) you can see normal microcline with another odd (to me) feldspar growth that resembles broccoli. It does not appear to be Albite.
Do please share your own feldspar twin photos or favorite photos you have seen.
31st Jul 2019 21:29 UTCEch Noch
1st Aug 2019 01:30 UTCSteve Hardinger 🌟 Expert
So without the sarcasm: No I don't think feldspar twinning is a reliable indicator of nearby pockets.
1st Aug 2019 02:22 UTCEch Noch
1st Aug 2019 13:48 UTCHarold Moritz 🌟 Expert
https://www.mindat.org/photo-800245.html
https://www.mindat.org/photo-951547.html
https://www.mindat.org/photo-901750.html
https://www.mindat.org/photo-392145.html
https://www.mindat.org/gallery.php?loc=9660&min=96 albite aggregates
Here is another specimen from an unknown locality with albite overgrowths on etched K-spar:
1st Aug 2019 20:57 UTCEch Noch
Hoppered Albite 1
Hoppered Albite 2
Hoppered Albites 3
1st Aug 2019 22:42 UTCHarold Moritz 🌟 Expert
2nd Aug 2019 00:08 UTCScott Rider
I do agree with Jobe re: the finding this type of microcline corresponds to lovely, large gem pockets, at least in DH. The chamber pocket had hundreds of gem smokies with none of the deficiencies one finds in the common smoky from this area (many specimens from DH are dull from iron oxides, have iron oxides on them, or have a milky secondary coating on the outside). The brain spar was inside the pocket as well as in many of the "satellite" pockets we found around the chamber, all of which had gem smokies and fluorites. And in other digs at DH, that are much smaller and that have the crappier quartz, the microcline was dull normal looking crystals with less perthitic attributes (like albite coatings that make the feldspar crystals very lustrous) and much less twinning.
https://www.mindat.org/photo-766343.html
2nd Aug 2019 00:37 UTCEch Noch
https://www.mindat.org/forum.php?read,11,313823,313865
2nd Aug 2019 01:08 UTCHarold Moritz 🌟 Expert
14th Jul 2021 05:53 UTCEch Noch
14th Jul 2021 06:29 UTCLuís Martins 🌟
14th Jul 2021 10:57 UTCHarold Moritz 🌟 Expert
Ed, I don't know who to refer you to, sorry.
14th Jul 2021 14:51 UTCTony Albini
14th Jul 2021 15:35 UTCEch Noch
14th Jul 2021 15:36 UTCEch Noch
14th Jul 2021 17:37 UTCEch Noch
14th Jul 2021 19:36 UTCErik Vercammen Expert
14th Jul 2021 21:11 UTCEch Noch
15th Jul 2021 09:13 UTCErik Vercammen Expert
14th Jul 2021 21:16 UTCEch Noch
https://youtu.be/vPknNOvzwnA
16th Jul 2021 13:59 UTCDana Morong
29th Sep 2021 19:02 UTCEch Noch
15th Jul 2021 19:38 UTCHarold Moritz 🌟 Expert
30th Sep 2021 23:33 UTCDon Windeler
Unfortunately I don't have much to add on the science behind what conditions drive this formation.
Cheers,
D.
3rd Oct 2021 15:10 UTCEch Noch
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