Obsidian in perlite
Oxides
Item number: MINS387
Price: EUR 8.00
(incl. sales tax 7%).Gross price is indicated for recipient country = Germany. Net EUR 7.48. Amount of sales tax depends on delivery address (EU sales tax reform as of July 1, 2021). Country setting can be changed in the shopping cart.
Perlite is an amorphous volcanic glass with relatively high water content. Perlite is formed by the hydration of obsidian. Obsidian is an acidic igneous rock belonging to volcanic glasses that are formed in the final stage of a volcanic eruption. The difference between perlite and obsidian lies in the crystal water content. Obsidian contains less than 2 percent bound water, perlite 2-5 percent.
| Format | 70 (the sample fits or fills up the box of 37x37x18 mm. Sample might be little higher) |
|---|---|
| Size | 33x27x22 mm |
| Crystal size (max.) | 11 mm |
| Weight | 19 g |
| Locality | Picketpost Mountain area, Superior, Superior Mining District, Pinal County, Arizona, USA |