Copiapoa cinerea

Recommended temperature zone: USDA: 10b-12
Frost tolerance: Avoid any frost
Minimum avg. temperature: 50°F (10°C)
Heat tolerance: Should be protected from excessive heat and sun in summer
Sun exposure: Full sun to part sun
Origin: Chile (Antofagasta, Chaaral)
Watering needs: Regular water in summer, but let the soil mix dry between waterings.

Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz