from Durango,
Mexico. 4.25 mm thick. Data Files: E⊥c;
E\\c
with occasional clear areas from the
Hybla roadcut, Ontario, Canada. 1.28 mm thick. Data Files: E⊥c; E\\c
,
from the Silver Crater Mine, Bancroft, Ontario, Canada. 1.26 mm
thick. Data Files: E⊥c;
E\\c
from the Fission
Mine, Bancroft, Ontario, Canada. 3.84 mm
thick. Data Files: E⊥c;
E\\c;
from an unspecified locality in Brazil. 0.831 mm thick. Data Files: E⊥c;
E\\c 
from Ihosy, northern Madagascar . This
sample
was
heat-treated to turn it from green to blue. 3.11 mm thick.
Data Files: E⊥c;
E\\c;
from Buckingham,
Quebec, Canada. 3.00 mm thick. Data Files: E⊥c; E\\c
from Buckingham,
Quebec, Canada. The differences between the
greenish-blue sample above and this one are subtle. 2.50 mm thick. Data
Files: E⊥c; E\\c
from Bahia, Brazil, 1.166 mm thick.
Data Files: E⊥c; E\\c
Hugo Mine, Keystone,
South Dakota. 0.191 mm thick. This color is
ascribed to MnO43-
subsituting in the PO43-
site. Data Files: unoriented
from Teofilo Otoni, Brazil. 0.496 mm
thick. Data Files: E⊥c; E\\c
from
Pennington, South Dakota, USA. 2.57 mm thick. Data Files: E⊥c; E\\c
from Paris, Oxford
County, Maine. 2.19 mm thick.
Data Files: E⊥c; E\\c
Maple Lode pegmatite, San Diego County, California, USA. 5.30 mm thick.
Data Files: E⊥c; E\\c
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