HYDRATES
Miscellaneous
- Family: None
- Region: None
- Mined At: Unspecified
- Raw Mineral: Yes
- Generic: No
Notes
(Richard Willis)
The water (H2O) carrying forms of some materials’ molecular compositions, carrying their water chemically in contrast to physically: which is to say that though the material appears to be dry it nevertheless contains the water-constituting elements hydrogen and oxygen combined in the water-defining proportion of two hydrogens to one oxygen, i.e., “H2O”. Some materials carry their chemical water more loosely than others and when hea
ted they loose their H2O easily and at relatively low temperatures (normally below 600ºC), in which case they have been de-hydrated and are called “anhydrates” or “anhydrous forms”. Hydrous forms tend to be more plastic and given to more shrinkage than anhydrous forms. Natural “clays” are, by definition, hydrous forms of aluminum silicates. Hydrous forms are usually preferred for hand building and throwing, and anhydrous forms f
or molding and casting.
Authors
- Richard Willis (Owner)
XML
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<material name="HYDRATES" descrip="" generic="0" rawmineral="1" searchkey="HYDROUS FORMS" loi="0.00">
<notes>
<note>The water (H<FONT SIZE=2><SUB>2</SUB></FONT>O) carrying forms of some materials&#146; molecular compositions, carrying their water chemically in contrast to physically: which is to say that though the material appears to be dry it nevertheless contains the water-constituting elements hydrogen and oxygen combined in the water-defining proportion of two hydrogens to one oxygen, i.e., &#147;H<FONT SIZE=2><SUB>2</SUB></FONT>O&#148;. Some materials carry their chemical water more loosely than others and when hea
ted they loose their H<FONT SIZE=2><SUB>2</SUB></FONT>O easily and at relatively low temperatures (normally below 600&ordm;C), in which case they have been de-hydrated and are called &#147;anhydrates&#148; or &#147;anhydrous forms&#148;. Hydrous forms tend to be more plastic and given to more shrinkage than anhydrous forms. Natural &#147;clays&#148; are, by definition, <B><I>hydrous</I></B> forms of aluminum silicates. Hydrous forms are usually preferred for hand building and throwing, and anhydrous forms f
or molding and casting.
</note>
</notes>
</material>
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