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The 3 most reliable microstructural criteria for the former presence of melt in a migmatite: crystal faces, pseudomorphs after melt films and nanogranitoids.
The is a granulite from the KKB of India.
microscope

15 66
2020-05-15

Day 34 of
for me is basically
More and in
From top left clockwise: Cordierite; Pyroxene, Plagioclase; Kyanite. Enjoy!

9 38
2020-04-17

Jurassic Bath Stone. Calcite cement crystals around the echinoderm fragments are clear and large (can you spot them?), and are much more resistant to weathering than small crystals around ooliths, so longest-lasting building stones tend to echinoderm-rich

7 17
2020-03-12

(on Friday)
I couldn't resist to post these spectacular pseudomorphs after melt films in the khondalites from the KKB, India.

6 34
2020-02-21


Tiger's Eye (South Africa) owes its chatoyancy to the fine intergrowth of fibrous quartz with needles of crocidolite.
Here some views under the microscope (width c. 3 mm)

24 55
2019-09-06


Gypsum-rich horizons of carnian age (230 million years) at the base of the dolostones of "Dolomia Principale" formation.

8 21
2019-06-27


Gypsum-rich horizons of carnian age (230 million years) at the base of the dolostones of "Dolomia Principale" formation.

2 8
2019-06-27

The famous 'Chromite Band' from the ultramafic layered intrusion, Isle of Rum, Showing peridotite and troctolite layers with chromite between. FOV 25mm. See https://t.co/OK0u52SXKp for more info and photos , + availability.

3 12
2019-02-14

Contrasting evidence of strain-solution of porphyroclasts (and lovely soft hues) in this schist.

27 64
2019-01-24

Another photomicrograph of Ocean Jasper from Madagascar recalling a explosion, but in just a 2-3 mm slice of rock.

15 35
2018-03-22