Endive is also a common name for some types of chicory (Cichorium intybus). There are two main varieties of cultivated endive: 1  Curly endive, or frisee (frisÃ©e var). 2  Crispum this type has, narrow, green curly outer.  leaves
Calcite is more stable and common than aragonite under the chemistry of our modern seas.) Hardness 3 (down to 2. but also the ease with which it forms. in the form of marble.5 to 4. Calcite forms in a range of settings from hot springs and underground caverns to growing coral reefs and seashells.
Calcite, calcium carbonate or CaCO3, is so common that it's considered a rock-forming mineral. More carbon is held in calcite than anywhere else. (more below) Calcite is used to define hardness 3 in the Mohs scale of mineral hardness. Your fingernail is about hardness 2Â½, so you can't scratch calcite.