### substance | mineral:

Metallic mineral
* are hydrophobic, which means they resist interaction with water
  - very important to most Saharan countries
* shine like metal, while non-metallic minerals vary greatly in their appearance.
+ Sahara, Environment: Deserts
  * Metallic minerals are very important to most Saharan countries. Algeria and Mauritania have several major deposits of iron ore. There are also bits of uranium, while Niger has the largest parts of them. A lot of phosphates are in Morocco and Western Sahara. Oil is mainly found in Algeria. The oil is very important to the economy of the entire country.

Muscovite
* Most Muscovites drink the water after boiling it.
* are micas

Natural mineral
* Many natural minerals are silicates.
* are the basis of most of the colours used today.

Ochre
* are colour.
* is clay and silica colored with various kinds of iron oxides
  - pigment

### substance | mineral | ochre:

Red ochre
* is known to have been used in many places around the world for a variety of reasons.
* kind of clay.

Olivine
* are minerals.
* exhibit planar fractures and mosaicism.
* frees the mind from sadness and evil passions.
* is colorless and has high relief in plane light
  - less reactive
* occurs apparently as secondary grains
  - predominantly in the darker materials in the southern hemisphere

### substance | mineral | olivine | chrysolite:

Peridot
* also calms nervousness and banishes negative emotions.
* facilitator of the birthing process, stimulating contractions.
* gem that's been connected to superstition.
* is also a very protective stone and can guard against psychic attacks
  - believed to open up mental and emotional blocks and stimulate honest communication
  - found in Australia, Brazil, China, Egypt, Myanmar, Norway, and the United States
  - one of the few gemstones that comes in only one color
* is the gem form of the mineral olivine
  - name for a yellow-green mineral that occurs in volcanic rock
  - quality transparent variety of the mineral called olivine
  - stone assigned to the sun
  - substitute for green emerald
  - used to attract love as well as to calm raging anger
  - yellow green, olive green, or grennish brown in color
* is, therefore, a gem of volcanic origin.
  * is one of the few gemstones that comes in only one color. The darkness of the green depends on how much iron there is. The color varies from yellow-green to olive to brownish green. Olivine very common mineral, but gem-quality peridot is rather rare. Peridot is the birthstone for the month of August.
* very bright medium yellowish-green to green, clean to the naked eye.

### substance | mineral:

Opal
* absorb and return the negativity of the wearer.
* also have characteristic colors due to impurities within the stone.
* are also fragile and can break with the slightest bump
  - quite soft and, if worn daily, are better protected in pendants and earrings
  - minerals
  - one of the few mineral gems considered to have no crystal structure, they are amorphous
  - precious stones
  - soft and like many other stones can become scratched and dull-looking over time
  - usually very fragile
* are very powerful in ritual magic
  - soft stones
* come in all colors.
* contain water, which eventually evaporates, damaging the opal.
* vary in optical density from opaque to semitransparent
  - widely in body color, with white the most common

### substance | mineral | opal:

Black opal
* All black opals come exclusively from Australia.
* are a valuable type of precious opals with a dark ground color
* is an opal
  - generally more sought after and more valuable than light opal