Minerals,
Journal Year:
2025,
Volume and Issue:
15(2), P. 138 - 138
Published: Jan. 30, 2025
The
raspberry-red
grossular,
discovered
in
the
Sierra
de
Cruces
Coahuila,
Mexico,
is
characterized
by
its
zoned
coloration,
featuring
a
pink
rim
and
black
mantle
with
sharp
color
transition
at
border.
However,
there
notable
lack
of
definitive
systematic
identification
characteristics
pertaining
to
special
zones.
mineral
chemical
composition
chromogenic
mechanism
remain
unsupported
empirical
validation
derived
from
specific
experimental
data.
In
this
study,
gemological
properties,
composition,
spectral
are
systematically
analyzed
explore
formation
zonal
genesis.
results
X-ray
diffraction
pattern,
Raman
spectrum,
major
elements’
show
that
grossular
samples
high
purity.
Mn
ions
direct
coloring
factor
samples,
while
Fe
elements
mantle.
MnO
content
ranges
0.15
wt%
1.72
wt%.
FeO
3.11
5.09
wt%,
which
generally
higher
than
other
parts.
trace
element
compositions
reveal
core
were
formed
an
oxidative
environment
(δEu
=
0.43–2.41),
could
be
hydrothermal
metasomatic
skarn
(δ18O
11.03–12.14);
mantles
reducing
0.42–0.85),
consistent
magmatic
11.40–11.66).
They
also
surrounding
rocks
provide
part
compositional
sources
for
interact
mantle,
affects
rim.
This
study
offers
geological
insights,
addressing
significant
void
lays
foundation
follow-up
investigations.
