### crystal:

Covalent crystal
* can have extremely high melting points.
* tend to be brittle because of the directional restriction.

Different crystal
* have different beautiful shapes and colors.
* promote specific changes in the body.

### crystal:

Emerald
* All emeralds contain inclusions formed during their growth.
* Any emerald is rare because of the extremely exceptional conditions in which emeralds are formed.
* Many emeralds come from contact metamorphosed black shale beds
  - seen in jewelry are of relatively low quality
* Most emeralds have fractures.
* Some emeralds have chemical structures
  - eyes
  - same chemical structures
* are a type of beryl crystal
  - beryls
  - far rarer
  - green only
  - jewels
  - minerals
  - notorious for containing flaws, and flawless stones are rare and greatly valued
  - one variety of beryl
  - precious stones
  - quite rare because of the rather limited geologic environment in which they can occur
  - rare and precious gems of the beryl family, distinguished by their rich green color
  - symbolic of fidelity, unchanging love and can help the wearer to forecast events
  - valuable because they are rare, rarer than diamonds
* can be both red and green
  - quite expensive
* have beautiful color, but are very rare and expensive with excellent clarity
  - many surface imperfections, which are known as inclusions
* help ease the pain of childbirth and enables the wearer to forecast events.
* love algae and are totally safe for all corals and marine life.
* occur in light to dark shades of yellowish green to green to bluish green.
* pay a high price for their distinctive green hue.
* vary in color from light to deep green.
* weighing more than several carats is extremely rare and costly.

### crystal | emerald:

Synthetic emerald
* Some synthetic emeralds have chemical structures
* have fractures.

Ferroelectric crystal
* All ferroelectric crystals are necessarily both pyroelectric and piezoelectric.
* are the electric analogues with two ends with opposite electric polarity.

Fine crystal
* Some fine crystals can be rather fibrous, almost asbestos-like.
* remove the outermost layer of skin cell, promoting renewal and a healthier complexion.

### crystal:

Flake
* Many flakes undergo metamorhism due to temperature variations.
* Most flakes feature a primary dorsal surface, dorsal negatives are rare.
* Some flakes are part of snowfall.
* Some flakes provide important nutrients
  - protein diets
* are essential to fish keepers
  - generally the most widely used type of food
  - only one type of food for goldfish
  - usually easier for most humas to lift and carry, and transport in their cars
* give higher conductivity, because of their great surface area.
* have edges.
* melt as much horizontally as they do vertically.
* require less storage space than whole pods and maintain color better than ground powder.

### crystal | flake:

Snow flake
* All snow flakes have six sides, but no two snow flakes are the same.
* are aggregates of ice crystals
  - located in skies
  - simply ice crystals while rain is just liquid water
* have lower moisture and higher air content than other types of precipitation.
* reduce visibility much more effectively than rain drops.