from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral form of magnesium hydroxide, Mg(OH)2.
from the GNU version of the Collaborative International Dictionary of English
- n. A white, pearly mineral, occurring thin and foliated, like talc, and also fibrous; a native magnesium hydrate.
- n. The mineral chondrodite.
from The Century Dictionary and Cyclopedia
- n. A native hydrate of magnesium, usually found in thin foliated plates, of a white or greenish color and pearly luster.
- n. Same as chondrodite.
The valley's also rich in brucite, and there's at least some gold.
The silicate and brucite layers share oxygen atoms which would normally be separated by distances of 0.305 nm in the silicate layer and 0.342 nm in the brucite layer.
Free brucite, present as contaminant in the fibers, also contributes to the pH increase.
In the case of chrysotile, an octahedral brucite layer having the formula (Mg6O4 (OH) 4) -4 is intercalated between each silicate tetrahedra sheet.
In the case of chrysotile, the crystalline structure is stable up to approximately 550° C (depending on the heating period), where the dehydroxylation of the brucite layer begins.
In the octahedral layer (brucite), magnesium can be substituted by several divalent ions, Fe+2, Mn +2, or Ni+2.
In the case of chrysotile fibers (in a given amount of water), the brucite layer will, fairly rapidly, dissolve in part, with concomitant increase in the pH of the solution.
In contact with solutions of mineral acids, organic acids, or magnesium complexing agents, the rate of dissolution of the brucite layers is increased.
A native magnesia of New Jersey, it was named after him: “brucite.”
It dissolves in acid readily with but little effervescence, which little, however, distinguishes it from brucite, which it sometimes resembles and which has a much lower-specific gravity when pure.
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