Mineralogy - Origin of Potassium-rich Silica-deficient Igneous Rocks - page 18

Table 2.2 (continued)
SiO 2 FeO a TiO 2 Al 2 O 3 Fe 2 O 3 CaO Na 2 O 2 O SrO MgO BaO Total An Ab Or Cn Sr-f

17 63.61 0.33 15.76 1.93 0.55 15.83 1.21

99.22

18 63.23 0.29 15.86 2.91 0.32 15.84 0.08 0.50

99.03

19 64.63 0.07 18.24 0.20 0.56 15.97 0.34

100.01

a Whenever FeO values are given, they indicate total FeO + Fe 2 O 3 contents
1 - 3 K-feldspars from Leucitic Tuffs Roccamonna, Italy (Luhr and Giannetti 1987)
3

6 K-feldspars from leucite tuffs, Latera Caldera, Italy (Turbeville 1993)
7 - 8 K-feldspars from Mt. Vulture complex, Italy (Melluso et al. 1996)
9

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11 Sanidines from lamproites, Smoky Butte, Montana (Mitchell et al. 1987)
12 - 14 Sanidines from K-rich rocks of Sierra Nevada (van Kooten 1980)
15 K-feldspar from a Cancarix lamproite, Albacete, Spain (Wagner and Valde 1986)
16 K-feldspar from a Jumilla lamproite, Murcia, Spain (Wagner and Valde 1986)
17 K-feldspar from a Smoky Butte lamproite, Montana, U.S.A. (Wagner and Valde 1986)
18 K-feldspar from a Moon Canyon lamproite, Utah, U.S.A (Wagner and Valde 1986)
19 K-Feldspar from Sisco Lamproite, France (Wagner and Valde 1986)

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