- less than 10%
anorthite content. The pure
albite endmember has the
formula NaAlSi 3O 8. It is a tectosilicate. Its
color is
usually pure white,
hence its...
- 3O 8),
albite (
NaAlSi 3O 8) and
anorthite (Ca
Al 2Si 2O 8). A
specific feldspar can have
varying quantities of pot****ium (K), sodium (
Na) and calcium (Ca)...
-
following reaction: 4 Ca
Al 2
Si 2 O 8 ( H 2 O ) 2 +
NaAlSi 2 O 6 ↽ − − ⇀ 2 Ca 2
Al 3
Si 3 O 12 ( OH ) +
NaAl 3
Si 3 O 10 ( OH ) 2 +
SiO 2 + 6 H 2 O {\displaystyle...
- (
Na,Ca)(
Al,
Si)
AlSi2O8
andesine (30 to 50)
NaAlSi 3O 8 – Ca
Al 2Si 2O 8
labradorite (50 to 70) (Ca,
Na)
Al(
Al,
Si)Si2O8
bytownite (70 to 90) (
NaSi,Ca
Al)
AlSi2O8...
-
following reaction: 4 Ca
Al 2
Si 2 O 8 ( H 2 O ) 2 +
NaAlSi 2 O 6 ↽ − − ⇀ 2 Ca 2
Al 3
Si 3 O 12 ( OH ) +
NaAl 3
Si 3 O 10 ( OH ) 2 +
SiO 2 + 6 H 2 O {\displaystyle...
- minerals) may have
epitaxic relations. An
example is
albite NaAlSi 3O 8 on
microcline KAl
Si 3O 8. Both
these minerals are triclinic, with
space group 1...
-
Labradorite ((Ca,
Na)(
Al,
Si)4O8) is a calcium-enriched
feldspar mineral first identified in Labrador, Canada,
which can
display an
iridescent effect (schiller)...
- Fe)3Si2O5(OH)4)
Felsic minerals Quartz (SiO2)
Feldspar (KAlSi 3O 8 –
NaAlSi 3O 8 – Ca
Al 2Si 2O 8)
Maskelynite Salts Gypsum (CaSO4·2H2O)
Perchlorate (ClO4−)...
-
breakdown of the
Na-feldspar, albite, by
carbonic acid to form
kaolinite clay is as follows: 2
NaAlSi 3 O 8 + 2 H 2 CO 3 + 9 H 2 O ↽ − − ⇀ 2
Na + + 2 HCO 3...
-
feldspar solid solution series. Its
chemical formula is (Ca,
Na)(
Al,
Si)4O8,
where Ca/(Ca +
Na) (% anorthite) is
between 30 and 50%. The
formula may be written...
