PHLOGOPITE Gallery Return to Phlogopite page. Click on image for larger view | |
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Species: PHLOGOPITE Locality: Soapstone Quarry, Francestown, NH Specimen Size: 6.5 cm specimen. Phlogopite (mica group) in quartz. Field Collected: Tom Mortimer Catalog No.: 1621 Notes: |
Species: PHLOGOPITE Locality: Soapstone Quarry, Richmond, NH Specimen Size: 1.5 cm field of view. Dark-brown phlogopite mica in cordierite matrix. Field Collected: Tom Mortimer - 2013 Catalog No.: 1869 Notes: Phlogopite confirmed by EDS analysis . A voucher specimen for phlogopite at the Richmond Soapstone Quarry. |
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Species: PHLOGOPITE - Ferroan Locality: Pegmatite outcrop in area of Richmond Soapstone Quarry, Richmond, NH Specimen Size: 2.4 cm phlogopite crystal Field Collected: Tom Mortimer Catalog No.: 1408 Notes: EDS analysis by Excalibur Minerals The Excalibur analysis indicated the closest fit was annite. I have accepted this for many years. A program that I wrote in the fall of 2022 to compute mineral chemistry from EDS weight% oxide data, when applied to the Excalibur report, gave a chemistry of K0.90Mg1.49Fe0.99Mn0.06Ti0.12Al1.88Si2.73O12 , normalized for 12 O. With Mg >> Fe, this cannot be annite. Mindat.org acknowledges ferroan phlogopite as a variety within the biotite group, although this is not given a species status, and states "Much so-called Biotite is actually Ferroan Phlogopite", K(Mg,Fe)3(AlSi3O10)(OH)2 |