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Water is not classified as a mineral, since it lacks a crystal structure being that it is in a liquid form. Scientifically it can be classified as a mineraloid. Many scientific groups and references, including the acclaimed Dana's System of Mineralogy, categorize some mineraloids, such as Opal and Mercury, together with the "true" minerals. However, virtually all mineral reference guides, including Dana's, exclude water from being classified as a mineral. We agree that it shouldn't be listed together with the minerals, nevertheless, we have included it in thus guide just for the purpose of delineating its properties so that it can be compared to the true minerals. (When water solidifies and turns into Ice, however, it is considered a mineral by all accounts.) Water and Mercury are the only two natural substances with a definitive chemical formula that occur in a liquid state at normal temperatures.

Water covers more than ¾ of the earth's surface, and is the most common and vital substance. It is a major solvent, dissolving more substances than any other liquid. For this reason, water is almost always impure.
Chemical Formula H2O
Composition Hydrogen oxide. Almost always impure, usually with salt.
Color Colorless, green, gray, brown. Reflection of the sky give large bodies of water a sky-blue color. The actual color of pure water is colorless with a slight blue tinge.
Streak -
Hardness 0
Crystal System Amorphous
Crystal Forms
and Aggregates
Water is an amorphous without any crystalline form.
Transparency Transparent to translucent
Specific Gravity 1
Luster Vitreous
Cleavage -
Fracture -
Tenacity -
Other ID Marks 1) Occurs in a liquid state.
2) Freezes at 32º F (0º C) and boils at 212º F (100º C).
3) When salt impurities are present, water is an electrical conductor.
Complex Tests Water is unique in that instead of contracting when it solidifies, like almost all other matter, it expands upon freezing, and reaches its maximum density at 39° F (4° C). Antimony also exhibits this strange property.
In Group Oxides; Hydroxides
Striking Features Liquid state
Environment Water occurs in large and small bodies still bodies of water (oceans, lakes, ponds, swamps), in moving streams and rivers, as raindrops, in puddles, as dew droplets, etc.
Popularity (1-4) 1
Prevalence (1-3) 1
Demand (1-3) 1

Hydrogen dioxide

 -  Water without salt impurities.
 -  Water mixed with salt, forming oceans, seas, and salt lakes.
 -  Synonym of Saltwater (above)

Water is the fiber of all life, and there is no physical substance more important than water.

water PHOTOS
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