Specimen data for Hastingsite

Tom Mortimer catalog number: 1394
Identification method: Visual, supported by EDS analysis. Species reported from this locality by Philip Morrill and others.
A polished grain EDS analyses (BC486) gave a reasonably good match for hastingsite chemistry, ideally,
NaCa₂(Fe²⁺₄Fe³⁺)(Si₆Al₂)O₂₂(OH)₂ .
Chemistry indicated bt the BC486 analysis is:
(Na_0.44,Mg_0.41,Ca_0.17) _Σ1.0Ca_2.29Fe_5.89(Si_6.37Al_1.69O22)(OH)₂ .
The amphibole T, C, B, A site filling best possible for the BC486 reported chemistry.
A 2006 EDS analysis by Cannon Microprobe gave the plot below. The BC analysis plot peaks agree quite well with the Cannon plot peaks above the Mg peak.

Notes: There are six valid species with Hastingsite as part of their name, including Fluoro, Chloro, Magnesio, and Potassic.