Feldspars (plagioclase and K-feldspar) and chlorite (clinochlore and daphnite) are predominantly dissolved (anorthite
will be excluded from discussion because it was added to fit the low concentration of Ca).
Enst: enstatite; Qz: quartz; Mul: mullite; Cris: cristobalite; Hem: Hematite; Anor: anorthite
Substance Heating rates/ (chemical composition) ([degrees]C/min) Room 5 10 20 temperature Quartz 10.80 4.00 4.20 3.20 (Si[O.sub.2]) (%) Kaolinite ([Al.sub.2][Si.sub.2] 11.60 0 0 0 [O.sub.5][(OH).sub.4]) (%) Microcline (KAl[Si.sub.3] 4.50 2.70 5.10 3.30 [O.sub.8]) (%) Anorthite
(Ca[Al.sub.2] 73.00 93.30 90.70 93.50 [Si.sub.2][O.sub.8]) (%) Calcium carbonate 0 0 0 0 (CaC[O.sub.3]) (%) Substance Heating rates/ (chemical composition) ([degrees]C/min) 30 40 50 Quartz 1.80 11.50 7.50 (Si[O.sub.2]) (%) Kaolinite ([Al.sub.2][Si.sub.2] 0 0 0 [O.sub.5][(OH).sub.4]) (%) Microcline (KAl[Si.sub.3] 3.70 6.50 29.70 [O.sub.8]) (%) Anorthite
(Ca[Al.sub.2] 94.50 80.10 60.90 [Si.sub.2][O.sub.8]) (%) Calcium carbonate 0 1.90 1.90 (CaC[O.sub.3]) (%)
The chemical heterogeneity of plagioclase is also manifested in marked core to rim zoning patterns within a single crystal (e.g., anorthite
from [An.sub.61] to [An.sub.10]).
Mole transfers of the reactive phases in mmol [L.sup.-1] Mole Reactive phase Chemical formula transfer Ca[X.sub.2] Ca[X.sub.2] -3.934 Mg[X.sub.2] Mg[X.sub.2] 1.965 NaX NaX 3.938 KX KX 0.000 [CH.sub.4(g)] [CH.sub.4(g)] -1.401 C[0.sub.2(g)] C[O.sub.2(g)] 4.781 Sulfur S 1.868 Albite NaAI[Si.sub.3[O.sub.8] -2.315 Anorthite
Ca[Al.sub.2][Si.sub.2][O.sub.8] 3.748 K-feldspar [Kal.sub.3][Si.sub.3][0.sub.8] 2.315 K-mica [Kal.sub.3][Si.sub.3][O.sub.10][(OH).sub.2] -2.499
Anhydrite, sillimanite, corundum, hematite, and anorthite
were also identified in small concentrations (less than 1%).
The phase composition of the samples of ceramic tiles is represented mainly by quartz, anorthite
and a small amount of hematite and almost the same for all investigated compositions.
Lignite Giral samnple 2 Table 1 Mineral matter % present Quartz (Si[O.sub.2]) 1.2 Anorthite
3.0 Diopside 2.5 Maghemite 3.9 Hematite 10.5 Anhydrite 78.4 Hexahydrite 0.5 Total 100.0
2) the formation of CA[S.sub.2] (anorthite
) was identified (Fig.
However, quartz, feldspar (such as albite/ anorthite
), several clay minerals (such as micas and illites, chamosite, chlorites, kaolinite and biotite), bayerite and calcite were common in sediment samples.
One of the Chandrayaan 1's findings, reported in September 2009, was a confirmation of the mineral anorthite
, rich in calcium plagioclase.