Mineralogical goniometer Mineralogical goniometer used to measure the angle of crystals, here with a specimen, 19th century 14.6h x 11.4w x 10.8d cm (5 3/4h x 4 1/2w x 4 1/4d in)
Mineralogical goniometer used to measure the angle of crystals, here with a specimen, 19th century 14.6h x 11.4w x 10.8d cm (5 3/4h x 4 1/2w x 4 1/4d in)
Mineralogical goniometer
