Forsterite gallery

FORSTERITE Gallery Return to Forsterite page. Click on image for larger view

FORSTERITE - Fe rich (Olivine) Everett Lake, Dike 2 rip-rap, Hopkington, NH 5 cm specimen with glassy green olivine blebs and glassy black augite embedded in basalt.	Species: FORSTERITE - Fe rich (Olivine) Locality: Everett Lake, Dike 2 rip-rap, Hopkington, NH Specimen Size: 5 cm specimen with glassy green olivine blebs and glassy black augite embedded in basalt. Field Collected: Tom Mortimer (Sept. 2007) Catalog No.: 1776 Notes: Fe rich forsterite identified by EDS analysis . Forsterite, Mg₂[SiO₄] , and fayalite, Fe₂[SiO₄] , form a solid solution series. This Hopkington, NH specimen is on the forsterite side of the series mid-point.
FORSTERITE Pulpit Rd. re-build, Bedford, NH 1.3 cm crystal, two views	Species: FORSTERITE Locality: Pulpit Rd. re-build, Bedford, NH Specimen Size: 1.3 cm crystal, two views Field Collected: Tom Mortimer - June 2011 Catalog No.: 1780 Notes: These olivine group crystals were initially discovered by Peter Cristofono in the weathered zone of a basalt dike exposed by 2011 blasting for the Pulpit Road widening project. The best formed crystals were found in the most weathered, frayable, dike material. The interior of these weathered crystals is a glassy pale yellow-green. A sample of this un-altered mineral was submitted to EDS analysis by Peter Cristofono. The result indicated the species is the olivine group mineral, not to far from the fayalite-forsterite series midpoint. See Joppa Hill olivine analysis. A follow-up polished grain, standardless, semi-quantitative EDS analysis (BC141) clearly indicated a forsterite olivine, with chemistry Mg_1.73,Fe_0.43SiO_3.53
FORSTERITE Pulpit Rd. re-build, Bedford, NH Looking down "c" axis of crystal above (to show symetry)	Species: FORSTERITE Locality: Pulpit Rd. re-build, Bedford, NH Specimen Size: Looking down "c" axis of crystal above (to show symetry) Field Collected: Tom Mortimer - June 2011 Catalog No.: 1780 Notes: Vertical dimension in view is 6 mm.
FORSTERITE Pulpit Rd. re-build, Bedford, NH 1.5 cm specimen, forsterite crystal with weathered surface in basalt	Species: FORSTERITE Locality: Pulpit Rd. re-build, Bedford, NH Specimen Size: 1.5 cm specimen, forsterite crystal with weathered surface in basalt. Field Collected: Tom Mortimer - June 2011 Catalog No.: 1779 Notes:
FORSTERITE Pulpit Rd. Bedford, NH 10 mm double terminated forsterite crystal FORSTERITE Pulpit Rd. Bedford, NH 10 mm double terminated forsterite crystal	Species: FORSTERITE Locality: Pulpit Rd. Bedford, NH Specimen Size: 10 mm double terminated forsteritecrystal Field Collected: Tom Mortimer Catalog No.: TBC Notes: Crystal surface undergoing alteration. Top photo, a stack of 11 images using scope trinocular port. Lower photo, stack of 14 images with 5X Bausch eye-loop stuck onto Canon G9 camera lens.