Calcium carbonate

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Calcium carbonate stone is a subcategory of stone which is useful in the production of quicklime. The following stones fall under this reaction class:

• " • Calcite
• ░ • Chalk
• ▓ • Limestone
• ▓ • Marble

Obtaining calcium carbonate stone

These stones can be mined out just like any other, but only form under certain conditions. Chalk and limestone form in sedimentary layers near the surface, while marble is metamorphic, making it a common find in the deeper Z-levels. Calcite only forms in clusters within layers of limestone and marble. Layers of calcium carbonate can often be spotted at embark by looking for "Flux Layer(s)" in the site description - so long as the flux stone in question is not dolomite, you'll have access to calcium carbonate very close to the surface. Dwarven caravans can bring any of the calcium carbonate stones as trade goods, but will not bring them in very large quantities.

Uses

The one unique trait of calcium carbonate stone is that it can be converted to quicklime powder at a kiln or magma kiln. This reaction requires an empty bag, as well as whatever fuel is necessary to operate the kiln. However, all calcium carbonate stone also qualifies as flux, a crucial element in steel production. Steel is unarguably the more valuable and practical product to pursue, as quicklime can only be used to produce milk of lime and parchment, but generally speaking, access to multiple layers of calcium carbonate stone will provide your fort with enough material to operate both industries. Additionally, all calcium carbonate stone has a value twice that of most stone, making it a good candidate for use in stone furniture or crafts.