David K. Joyce

Gypsum

$65.00
5.9x6.3x0.5 cm
Chamberlain

South Dakota, USA

GypsumGypsum

Item number: 21207

A very interesting concretion or growth of gypsum!! The crystals have somehow formed in a spiral, with terminations on the outer rim. Actually, I'm not sure that spiral is the exact name for this shape but have a look at the photo's?! Very interesting, unusual and cool! t