Some Gneiss rings carved as a commission..
We can make rings to order if required

#gneissthings #gneiss #lewisian #isleofharris #isleoflewis #northuist #benbecula #southuist #barra #slowcarved #handcarved #stone #rings #jewellery #outerhebrides #hebrides #isleofskye

A Lewis (me) on the 3 billion year old Lewisian Gneiss in northern Scotland. #geology #oldrocks #geoetc #lewisian #scotland

A black Outer Hebrides dyke cuts across the pre-existing foliation in grey Archaean Lewisian gneiss. Thin apophysis (offshoot) and the hinge zone of the folded dyke exhibit near perpendicular angular discordance to the foliation. These rocks were folded during Laxfordian deformation and strong flattening in the limbs of the folds brought the contact of the dyke and the foliation into concordance. This outcrop is located west of the village of Rhenigidale, Isle of Harris, Outer Hebrides.

A beautiful example of an Outer Hebrides dyke cutting the foliation in Archaean #Lewisian gneiss. Although folded by later Laxfordian deformation both the dyke and a thin apophysis exhibit near perpendicular angular discordance in the fold hinge, becoming concordant in the limbs.
Isle of Harris. ⚒️🧪

Tall grey cliffs being battered by a rough sea. Older grey Lewisian gneisses and black amphibolites are intruded by salmon-pink granitic pegmatites and aplites of Late-Laxfordian age. The cliffs are located near the Mangersta bothy on the west coast of the Isle of Lewis, Scotland.

My OH is a keen walker and getting quite good at photographing interesting geological locations. This has gone to the top of my Spring excursion list.

Pink #Laxfordian granitic intrusions invading #Lewisian gneisses and amphibolites.

Mangersta, #IsleofLewis ⚒️🧪

Predominantly grey rock has yellow coloured bands and porphyroclasts picking out a mylonitic fabric which has been repeatedly folded. Early isoclinal folds, with near parallel limbs, have been tightly tightly refolded. The southern end of the beach has some of the best folding I have seen, (when not obscured by sand). The beach, Traigh Shanndaigh, near Eòrapaidh (Eoropie) is located at near the top (northern end) of the Isle of Lewis and faces the Atlantic.

Spot the refolded isoclinal #FridayFold.

Traigh Shanndaigh near Eòrapaidh (Eoropie), #IsleofLewis

⚒️🧪 #Lewisian #Geology

Banded grey Lewisian gneiss with some thicker layers of white or pink granitic pegmatite and black amphibolite show complex folding. In some cases the folds are affected by shearing. The outcrop is well exposed and clean, having been wave washed to keep it clear of surface algae/shellfish/seaweed. The compass-clinometer scale is 15cm long.

There are many larger folds in the #Lewisian gneisses around Cunndal Bay, #IsleofLewis, but these #FridayFolds are the best exposed, (cleanest) I've seen, so far.
⚒️🧪 #Geology

A spectacular seascape on the west coast of the Isle of Lewis with waves breaking on rocks at the base of high cliffs. The grey and pinkish grey Lewisian gneisses show complicated folding and faulting, often offsetting dark grey to black Outer Hebridean dykes, (also Lewisian in age these were formerly called Scourie dykes).

The sea cliffs on the west side of the #IsleofLewis provide some spectacular cross sections through #Lewisian gneisses.

I guess I'm putting a drone at the top of my Xmas list.
⚒️🧪 #Geology

A #FridayFold from the west coast of the #IsleofLewis.
The dark mafic #OuterHebrides dykes were intruded into the #Lewisian gneiss. The original cross cutting relationship has been brought into near concordance during subsequent #Laxfordian deformation which also generated these folds.
⚒️🧪

@calamitaman.bsky.social

Hope these #Lewisian gneisses seen on Berneray in the #OuterHebrides are what you are hoping to see🤔.

They had certainly experienced a long and complicated tectonic history before being intruded by the late #Laxfordian pegmatite.
⚒️🧪

Tiger stipe camouflage isn't really effective on the west coast of the #IsleofLewis👀
Compositional (rhythmic?) banding is preserved locally within an occurrence of #Lewisian "Older Basic Suite" meta-basics/ultrabasics.
#Archaean ⚒️🧪

#FieldtripFriday revisited. In 1975 I visited this unconformity on the north side of Loch Assynt where #Torridonian sandstones and conglomerates overlie #Lewisian gneiss.
I even spotted the ledge I climbed onto to point out the unconformity surface to my classmates.
#Geology ⚒️🧪

Attenuation of the limbs in these folds has left some of the fold hinges essentially floating.
#Laxfordian folding on the north west coast of the #IsleofLewis
#TectonicTuesday #Geology #Lewisian #Folding ⚒️🧪