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Gedrite : ◻{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2, Almandine : Fe2+3Al2(SiO4)3, Albite : Na(AlSi3O8), Amphibolite

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Copyright © 2020 Harold Moritz
 
 
 
 
 
minID: 5L3-0RY

Gedrite : ◻{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2, Almandine : Fe2+3Al2(SiO4)3, Albite : Na(AlSi3O8), Amphibolite

Copyright © 2020 Harold Moritz   - Creative Commons Non-Commercial Share Alike Licence - Some Rights Reserved
Dimensions: 8 cm x 8 cm x 4 cm
Largest Crystal Size: 3.5 cm
Weight: 424 g

Sample of the "garnet-gedrite rock" described by Lundgren (1979), from the Middletown Formation near Turkey Hill Reservoir. The garnet is almandine (via EDS) and the black gedrite is near the composition boundaries between gedrite, anthophyllite, ferro-anthophyllite and ferro-gedrite fields, under the current amphibole classification, but just within the gedrite range, based on multiple TEM-EDS analysis (see https://www.mindat.org/photo-802443.html from same outcrop). The garnets are actually aggregates of smaller grains. Light colored mineral is albite with minor gray quartz.

Collected: 2016

This Photo was Mindat.org Photo of the Day - 29th Oct 2020

This photo has been shown 894 times
Photo added:10th Feb 2017
Dimensions:3900x3300px (12.87 megapixels)
Camera:CANON EOS 600D / Rebel T3i / Kiss X5

Data Identifiers

Mindat Photo ID:802461 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:802461:6 📋
GUID:7add5d83-9a9b-4556-b83e-bb98f6210a06 📋
Specimen MinID5L3-0RY (note: this is not unique to this photo, it is unique to the specimen)

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Discuss this Photo

PhotosPTOD Great Photo / Even Better Description

29th Oct 2020 15:36 UTCDonald B Peck Expert

Hello Harold,

Great photo!   I wish all POTD were described as well as yours.  And it is wonderful to see a specimen with an assemblage that we might find and that teaches us about the composition.

From a former Connecticut Yankee.

Don 

29th Oct 2020 20:59 UTCRalph S Bottrill 🌟 Manager

Interesting rock, I added amphibolite to the title, it’s a great example though a little odd in composition, would be good to know more on its origin, presumably a hydrothermally altered and metamorphosed basalt?

29th Oct 2020 21:04 UTCFrank K. Mazdab 🌟 Manager

Looks like a sample that would make for a colorful and interesting thin section as well.

30th Oct 2020 11:39 UTCHarold Moritz 🌟 Expert

Thanks. The distinctive Middletown Formation is mostly island arc metavolcanics, Mg-rich (probably a fair amount of olivine in the ash), so there are anthophyllite-cordierite gneisses (with magnetite and tourmaline), magnesiohornblende amphibolites, and volumetrically rare gedrite-rich ones. The area was mapped in the 1960s and 1970s so it took a fair amount of testing (thanks Frank Craig) to see if some are "still" gedrite after all the amphibole redefinitions. Normally there would not be such a detailed description, but I felt it necessary here because the crystals just look like "hornblende".

30th Oct 2020 20:02 UTCRalph S Bottrill 🌟 Manager

Thanks Harold. It would be great to add this information and some references to the locality page; it didn’t have any references so I just added one.
 
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