Locality: Soapstone Quarry, Francestown, NH
Specimen Size: 6.5 cm specimen. Phlogopite (mica group) in quartz.
Field Collected: Tom Mortimer
Catalog No.: 1621
Notes:
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.
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