Natural Kieserite is a naturally occurring hydrated magnesium sulfate mineral with the chemical formula MgSO₄·H₂O. As a type of single hydrate magnesium sulfate, Natural Kieserite forms in marine evaporite deposits through long-term geological evaporation of salt lakes and ancient seawater. The mineral usually appears as white or pale grey crystalline granules, and it has a slightly bitter taste. Unlike synthetic magnesium sulfate, Natural Kieserite is mined directly from mineral beds with relatively simple processing, retaining natural trace mineral elements beneficial to plant growth.

Natural Kieserite boasts stable physical and chemical properties. It is sparingly soluble in water and dissolves gradually, which enables slow release of magnesium and sulfate ions into soil. Magnesium is the core component of chlorophyll, while sulfur is an essential nutrient for synthesizing plant amino acids, proteins and enzymes. Therefore, Natural Kieserite functions as a premium magnesium-sulfur fertilizer, widely applied in farmland, orchards and cash crop plantations. It can effectively correct magnesium deficiency and sulfur deficiency in soil, strengthen crop photosynthesis, improve plant stress resistance, and increase yield and fruit quality.

In agricultural application, Natural Kieserite fits a wide range of crops including fruits, vegetables, grains, oil crops and flowers. It is compatible with most common fertilizers and can be used for base fertilization, topdressing and soil amendment. Compared with Epsom salt (heptahydrate magnesium sulfate), Natural Kieserite has lower moisture content and better anti-caking performance, convenient for long-term storage and bulk transportation.

Besides agriculture, Natural Kieserite can serve as raw material for manufacturing magnesium chemicals and feed additives after purification. It is also used in some industrial sectors for wastewater treatment and mineral additives. With rich natural reserves and eco-friendly characteristics, Natural Kieserite is a sustainable mineral nutrient source, gaining growing popularity in global fertilizer markets to support high-efficiency and green agriculture.