Insoluble calcium refers to calcium compounds that do not easily dissolve in water or other liquids. Instead of dissolving, they tend to stay as solid particles or sediment. Full definition
All parts of the Chinese evergreen contain insoluble calcium oxalate crystals and these crystals are known for causing intense pain and irritation when chewed or swallowed. (wagwalking.com)
The Araceae family of plants often contain insoluble calcium oxalate crystals in all parts of the plant. (wagwalking.com)
But this generalized rate of absorption can vary dramatically from food to food, and the presence of oxalates in food is definitely a dietary factor that lowers calcium absorption (through the formation of insoluble calcium oxalate salts). (whfoods.org)