Stones and wood
Elephant skin stone
Reusable
Grey stone with a wrinkled, cracked skin.
What the simulation uses
- Holds water
- 2.5 % by volume
- Water it keeps after draining; the rest runs down to the drainage.
- Pore space
- 5.5 % by volume
- Room for air and water between grains; low means roots suffocate when wet.
- Weight
- 1450 g/L
- How heavy a litre is.
- pH
- 7 to 8.5 pH
- How acid it keeps the soil.
- Mould risk
- none
- How much fresh food it gives white mould; high-risk soils fuzz over in the first weeks.
- Nutrients
- none
- Plant food it brings.
Description
The name comes from the aquascaping trade, and nobody is sure what rock it really is. Treat it as mostly inert but possibly lime-bearing. Drip vinegar on it first, and if it fizzes, expect it to raise pH.
Also called elephant skin rock.
Estimated, where sources were thin: lithology unknown (trade name not resolved); density, porosity and pH effect all estimated; no item-specific source found.