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N ° de modèle:
talc
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Egypt
Personne àcontacter Mr. mohamed
cairo, cairo, cairo
 Cleavage
Perfect on {**1} basal cleavage
Fracture
Flat surfaces (not cleavage), fracture in an uneven pattern
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Mohs scale hardness 1 (defining mineral)
Luster
Waxlike or pearly
Streak
White to pearl green
Diaphaneity
Translucent
Specific gravity
2.*8 to 2.*3
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Pleochroism
Weak in dark varieties
Ultraviolet fluorescence
Short UV=orange yellow, long UV=yellow
Analysis
No. 1 of talc
SiO2 Â MgO Â Fe2O3 Â Al2O3 Â L.O.I
 Bright
*2.*6 Â *1.*4 Â 0.*5 Â 0.*2 Â 4.*8 Â *6
Grade No. 2
SiO2 Â MgO Â Fe2O3 Â Al2O3 Â L.O.I
 Bright
*2.7 Â *0.*4 Â 0.*9 Â 0.*6 Â 4.*1 Â *5
Grade No. 3
SiO2 Â MgO Â Fe2O3 Â Al2O3 Â L.O.I
 Bright
*2.*1 Â *0.*4 Â 0.*1 Â 0.*8 Â 5.*2 Â *7
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general
Talc is a metamorphic mineral resulting from the metamorphism of
magnesian minerals such as serpentine, pyroxene, amphibole,
olivine, in the presence of carbon dioxide and water. This is
known as talc carbonation or steatization and produces a suite of
rocks known as talc carbonates.
Talc is primarily formed via hydration and carbonation via the
following reaction;
serpentine + carbon dioxide → talc + magnesite + water
2 Mg3Si2O5(OH)4 + 3CO2 → Mg3Si4O*0(OH)2 + 3 MgCO3 + 3 H2O
Talc can also be formed via a reaction between dolomite and
silica, which is typical of skarnification of dolomites via
silica-flooding in contact metamorphic aureoles;
dolomite + silica + water → talc + calcite + carbon dioxide
3 CaMg(CO3)2 + 4 SiO2 + H2O → Mg3Si4O*0(OH)2 + 3 CaCO3 + 3
CO2
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| Pays: | Egypt |
| N ° de modèle: | talc |
| Prix FOB: | ( Negotiable ) Obtenir le dernier prix |
| Localité: | - |
| Prix de commande minimale: | - |
| Commande minimale: | - |
| Packaging Detail: | - |
| Heure de livraison: | - |
| Capacité de Fournir: | - |
| Payment Type: | T/T, L/C, D/P, PayPal, Other |
| Groupe de produits : | - |
