Brammallite
Brammallite is a sodium rich analogue of illite. First described in 1943 for an occurrence in Llandybie, Carmarthenshire, Wales, it was named for British geologist and mineralogist Alfred Brammall (1879–1954). Believed to be a degradation product of paragonite, like illite it is a non-expanding, clay-sized, micaceous mineral. Brammallite is a phyllosilicate or layered silicate. Structurally, brammallite is quite similar to muscovite or sericite with slightly more silicon, magnesium, iron, and water and slightly less tetrahedral aluminium and interlayer potassium.
primaryTopic
Brammallite
Brammallite is a sodium rich analogue of illite. First described in 1943 for an occurrence in Llandybie, Carmarthenshire, Wales, it was named for British geologist and mineralogist Alfred Brammall (1879–1954). Believed to be a degradation product of paragonite, like illite it is a non-expanding, clay-sized, micaceous mineral. Brammallite is a phyllosilicate or layered silicate. Structurally, brammallite is quite similar to muscovite or sericite with slightly more silicon, magnesium, iron, and water and slightly less tetrahedral aluminium and interlayer potassium.
has abstract
Brammallite is a sodium rich a ...... es x-ray diffraction analysis.
@en
La brammallite è una serie di ...... ono ancora stati ben definiti.
@it
Wikipage page ID
11,814,039
Wikipage revision ID
544,839,149
birefringence
δ = 0.030 - 0.035
category
cleavage
Perfect on {001}
diaphaneity
gravity
habit
Earthy clay like
luster
opticalprop
Biaxial 2V: Measured: 5° to 25°
refractive
nα = 1.535 - 1.570 nβ = 1.555 - 1.600 nγ = 1.565 - 1.605
system
Monoclinic prismatic 2/m
hypernym
comment
Brammallite is a sodium rich a ...... nium and interlayer potassium.
@en
La brammallite è una serie di ...... ono ancora stati ben definiti.
@it
label
Brammallite
@en
Brammallite
@it
wasDerivedFrom
isPrimaryTopicOf
name
Brammallite
@en