Veith JA, Sposito G (1977) Reactions of aluminosilicates, aluminum hydrous oxides, and aluminum oxide with o-phosphate: the formation of X-ray amorphous analogs of variscite
Operational chain and techno-typological analysis of the prehistoric adornments of variscite
from the center-south-west of the Spanish North Plateau.
Basic features of the variscite
extraction in Palazuelo de las Cuevas (Zamora)
We have implemented CGW based on Variscite
System-on-Module (SoM) with Linux Debian operating system.
The gemological and mineral characteristics of variscite
from Ma'anshan of Anhui Province.
For example, the mineral variscite
(AlP[O.sub.4*]2[H.sub.2]O) may precipitate when soil pH is below 5.5, anaerobic conditions are present, and aluminum and phosphate are available.
Enfin, cette transformation d'ordre culturel et social semble valoir pour les animaux et pour certaines matieres minerales exploitees sur ou a proximite des figures peintes (silex, serpentine, variscite
, minerai de cuivre, etc.).
In 1834, the Heidelberger-Mineralien Comptoir sold what would become the type specimen for variscite
to August Breithaupt.
Inspired by the Southwest, The Suzanne ($40) features a subtle heel and multiple stones in finishes of turquoise, coral, variscite
, opal, and onyx.
Lindsay (1979) described minerals such as variscite
, strengite, and barrandite are insoluble at pH <2, but readily hydrolysed when the pH is increased, such as in the presence of NaOH.
Lindsay (1979) showed that at a pH greater than 6.5 the most stable P minerals were Ca phosphates and at a pH less than 6.5, Al and Fe phosphates such as variscite
and strengite were most stable.
Secondary hydrous oxide minerals such as stengite (Fe(P[O.sub.4]) x [H.sub.2]O) and variscite
(Al(P[O.sub.4]) x 2[H.sub.2]O) are extremely insoluble P forms (Table 10-4).