Neither this mineral nor elemental manganese is magnetic. The province is rich in mineral deposits. Diamond is the hardest known natural mineral. Most of the mined potassium mineral ends up as potassium chloride after processing. Printers first used natural colour dyes made from mineral or vegetable sources. Both mineral and organic pigments are used. Gypsum is the most common sulfate mineral. Other questions concern overlap between geothermal and mineral or petroleum tenements. Growth of terrestrial plants without soil in mineral nutrient solutions was called solution culture. Grease generally consists of a soap emulsified with mineral or vegetable oil. Smaller amounts are incorporated into multi-vitamin/mineral tablets. Pigments are categorized as either inorganic (mineral) or organic (synthetic). The company manufactures mineral and herbal products. The country is rich in mineral and geothermal energy resources. Land, water, mineral and oil, etc.