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| Submitted by | DrewParsons |
| Added | Oct 11 2011 |
| Hits | 436 |
| Votes | 0 |
Description
Close up of one of the capstones illustrating the attractive embedded pink quartz in the rock. The adjacent Valstad 8:1 has many boulders of this rock on its upper mound. September 2011.
Posted Comments:
Martin L (2011-10-11)
Hard to tell from a photo, but is it possibly potash feldspar? I assume the whole rock is of that colour, but overgrown with lichen.
Runemage (2011-10-11)
"Quartz is found in igneous, sedimentary and metamorphic rocks. Feldspar is found in granite bodies and pegmatite bodies." more at
http://www.differencebetween.net/object/difference-between-quartz-and-feldspar/ "
It is difficult to tell sometimes just by looking, especially when both can appear quite crystalline.
http://www.differencebetween.net/object/difference-between-quartz-and-feldspar/ "
It is difficult to tell sometimes just by looking, especially when both can appear quite crystalline.
DrewParsons (2011-10-12)
Tilley in The Dolmens and Passage Graves of Sweden on page 184 states that the capstones are granite. The pink coloured areas are intrusive, most of the capstone is grey.
DrewParsons (2011-10-12)
Riksantikvarieämbetet Fornsök calls the rock gnejs which translates as gneiss and not being a geologist (but our son is) I found this note from Wikipedea which backs up Tilley's statement that the rock is granite: " Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, etc"
Martin L (2011-10-12)
Yes, there is no difference regarding the minerals involved. Granite mainly consists of (very simplified) feldspar, quartz and mica (If I remember right from school ;)
So as RAÄ states it is gnejs, this will be an orthogneiss here (= a gneiss deriving from granite). The red colour more often is related to the potash feldspar.
So as RAÄ states it is gnejs, this will be an orthogneiss here (= a gneiss deriving from granite). The red colour more often is related to the potash feldspar.
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