### substance | mineral | calcite:

Pure calcite
* form of calcium carbonate.
* is colorless and transparent, sometimes with rhombus- shaped crystals
  - white and almost colorless

Carbonate mineral
* are generally rare to frequent in abundance and, at times, are common
  - soft and are often colorful
  - the most important non-silicate mineral group for our study
* occur in mudrocks with about the same abundance as feldspars.
* react by bubbling when a drop of hydrochloric acid is put on their surface.

### substance | mineral:

Chlorite
* Some chlorites are explosives.
  * ' is an ion. It is an oxidizing agent. They can be known as salts of chlorous acid. Some chlorites are explosives. It can be made by dissolving chlorine dioxide in a base. It can also be made by reduction of chlorate with hydrogen peroxide. Sodium chlorite is the most common chlorite.
* are chemical compounds
  - generally green and crystallize in the monoclinic symmetry system
  - made by reacting chlorous acid with a base
  - minerals
* occur in a wide variety of low and medium grade metamorphic rocks.
* takes place of pyroxenes.
+ Chlorous acid: Acids :: Chlorine compounds
  * Its chemical formula is HClO2. It contains chlorite ions. It is not stable. It easily disproportionates to hypochlorous acid and chloric acid. It is a strong oxidizing agent. Chlorites are made by reacting chlorous acid with a base. They are more stable. It can be made by reacting barium chlorite with sulfuric acid. This makes insoluble barium sulfate and chlorous acid.

Chrysoberyl
* Most chrysoberyl is green or yellow-green, but some is brown.
* are minerals.
* is mainly green, yellow or brown.
* very hard, and durable gemstone.

Colloidal mineral
* Some colloidal minerals have a long history as medicinals.
* are bio-electrical minerals that come from food digested by prehistoric plants
  - different in many respects from the previously discussed minerals
  - minerals in an ionized form
  - molecules of minerals floating in a liquid
  - simply smaller rocks suspended in water
  - twice as absorbable as chelated minerals
* have special properties since they have very big surface areas.

Coltan
* contains tantalum - a metal vital to the production of mobiles.
* is also the fuel that keeps the Congo's endless civil war burning
  - made into a component for many digital products such as cell phones
  - used in high-tech products including cellphones, computer chips and nuclear reactors
* mixture of columbite and tantalite, both in demand for various high-tech uses.

Common mineral
* Some common minerals are feldspar, quartz, calcite, mica, and hornblend
  - contain calcium
  - found in such water are calcium, iron and sodium
* exhibit a wide range of compositions.
* include quartz.

Cordierite
* appears in the sillimanite zone.
* have low coefficients of thermal expansion and excellent resistance to heat shock.
* is structurally similar to beryl, and common metamorphic mineral.

Dark mineral
* are usually biotite and amphibole.
* occur as phenocrysts and in the lamprophyre groundmass.

Different mineral
* expand and contract at different rates causing stresses along mineral boundaries.
* have different colours
  - densities, and therefore weigh differently
* melt at different temperatures.
* turn different colors as they form and react with trace amounts of oxygen.
* weather at different rates.

Essential mineral
* Some essential minerals stimulate excretion.
* are a factor in cellular functions in particular, enzyme reactions
  - obtained from mineral licks
* leak out and the fungus dies.