### stone | chondrite:

Carbonaceous chondrite
* are a rare find on Earth because they are very fragile
  - among the most primitive of meteorites
* are the most pristine, organically-rich meteorites known
  - rarest of all meteorites
  - youngest meteorites
* contain amino acids
  - carbon and volatile elements and compounds
  - many of the building blocks of life
  - tiny jewels - presolar diamonds and sapphires
* make up only two percent of all meteorite finds.

Chrysoprase
* are precious stones.
* can help to promote courage and can open and heal old traumas and grief.
* comes mainly from Germany, the Soviet Union, the United States, Canada, and Brazil.
* is one of the most sought after gem materials for carving, cabochons, and inlay work
  - quartz
  - the most valuable variety of chalcedony, a microcrystalline form of quartz
* light to medium, slightly yellowish green chalcedony.
* vivid green.

Cobble
* are a size of gravel larger than pebbles, but smaller than boulders
  - present in some pedons
* are, however, abundant in beaches of the extinct lake.
* predominate in most pedons.
* remain on the surface, where trees that are now off to the side once grew.

### stone:

Concretion
* Some concretions form nodular masses.
* are most common on the central portion of axillary hair
  - nodules that commonly form around dead organisms or shell material
  - roughly concentric bodies with a different composition from the host rock
  - round, hard compact masses that form from mineral precipitation in shale
  - solid and grow outward from a central core
  - zones of cementation formed in sedimentary rocks
* come in many shapes, sizes and vary in mineral content.
* encircle the hair shaft, making it appear beaded or thicker.
* have crude internal symmetry organized around a point, a line, or a plane.
* is natural processes.
* look like smooth boulders and are common throughout the world.
* occur in adults and increase with age.
* vary in size, but are most often about as big as a bowling ball or curling rock.

Cut stone
* are rare due to the small size of the crystals and the cost.
* sold as marcasite are usually pyrites.

Dimension stone
* is stone that has been selected and cut to specific shapes or sizes
  - uncrushed rock that has been cut into specified sizes for use in construction
  - used for facing, curbing, flooring, stair treads, and other architectural work
+ Schist: Metamorphic rocks
  * Schists are frequently used as dimension stone. Dimension stone is stone that has been selected and cut to specific shapes or sizes.

### stone:

Dolomite
* hard rock formed when limestone is infused with magnesium.
* has higher levels of calcium and magnesium
  - major drilling deficiencies as a pearl nucleus
* is also an extremely fibrous mineral
  - an important rock-forming mineral in the dolostones throughout the county
  - another type of limestone
  - considered a carbonate rock
  - crushed limestone that is made into pills for mineral supplements
  - difficult to distinguish from calcite in thin section, without special treatment
  - more suitable for decorative items than mugs
  - much more common in Paleozoic rocks than in Tertiary rocks and sediments
  - similar to limestone, but has a bit of magnesium substituting for some of the calcium
  - slightly harder than calcite, although it can easily be scratched by a knife
  - sold as crushed stone
  - the chief mineral in dolostone
* is used as a flux in the steel making process
  - for road construction
  - to make magnesia
* magnesia-rich sedimentary rock resembling limestone.
* minor but ubiquitous component throughout the core.
* occurs as disseminated rhombs and cemented beds and nodules
  - in the more landward lakes
* very common mineral and ankerite is much more scarce.

Foundation stone
* Some foundation stones are part of skyscrapers.
* are part of buildings