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| Serpentine and Augite Sterling Silver Pendant and 18 Bea... |
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Surrender to your stylish desires with this
Serpentine and Augite Sterling Silver Pendant
and Bead Necklace. A freeform
serpentine/augite cabochon(approx. 41x18mm)is
bezel-set in shimmering frame...
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Tags : HSN Home Shopping Network Serpentine and Augite Sterling Silver Pendant 18 Bea... |
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Affichage : 35
Durée : 284 s |
| Serpentine and Augite Sterling Silver Pendant with 18-1/... |
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Wearstones formed by the sheer willpower of
the earth withour Serpentine and Augite
Sterling Silver Pendant withBeaded Necklace.
Thispendant features a bezel-set,freeform
serpentine/augite...
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may not represent the current price. View
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HSN Item #301098
Tags : HSN Home Shopping Network Serpentine and Augite Sterling Silver Pendant with 18-1/... |
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Affichage : 13
Durée : 249 s |
| Mining for Augite |
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Josh "The Terrible" and Blake's Robot take me
on their excursion into the west mountains of
Oregon to dig augite crystals.
Tags : Mining Oregon |
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Affichage : 27
Durée : 268 s |
| JMDMT #2499 Microfossils of Cyanobacteria in Carbonaceous Meteorites |
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The James M. DuPont Meteorite Collection -
micrometers. A characteristic feature of the
Ca profile of augite lamellae in Ibitira
pyroxene is a gradient near the interface
between augite and low-Ca pyroxene (Fig.
1). Even if the spatial resolution of the
electron microprobe is taken into
consideration, the gradient is significant.
The Ca profile of augite lamellae usually
shows a rectangular shape. The chemical
composition of augite lamellae is
Ca42Mg31Fe27 and the host low-Ca pyroxene
is Ca4Mg39Fe57. The bulk composition of
Ibitira pyroxene is Ca16Mg36Fe48 and is
independent of the width of lamella which a
pyroxene contains. We computed the best-fit
cooling rate or burial depth by matching the
calculated width of augite lamella to the
observed profile [4], although the Ca
profile
Tags : Meteorite Life Fossils Cyanobacteria Carbonaceous |
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Affichage : 5
Durée : 67 s |
| JMDMT #2482 Microfossils of Cyanobacteria in Carbonaceous Meteorites |
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The James M. DuPont Meteorite Collection -
was detected in either sample by
petrographic analyses. Silicates are
anhedral to subeuhedral and are slightly
oriented. Both orthopyroxene (Opx) and
augite (Aug) meet olivine with triple
junctions and sometimes have round
interfacial boundaries. Orthopyroxene
includes rare, small, round grains of
olivine (FRO 93008) or olivine and augite
(FRO 90054). Metal and troilite occur in
veins and swarms of droplets inside the
silicates, sometimes with an overall
isooriented distribution. The PTS of FRO
93008 is compositionally heterogeneous,
consisting of three subparallel irregular
"belts." The central belt consists of
olivine and augite with traces of
orthopyroxene, and the two adjacent areas
of olivine and orthopyroxene with minor
augite. Two
Tags : Meteorite Life Fossils Cyanobacteria Carbonaceous |
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Affichage : 6
Durée : 69 s |
| JMDMT #2009 Microfossils of Cyanobacteria in Carbonaceous Meteorites |
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The James M. DuPont Meteorite Collection -
and LEW [3-5]. In the poikilitic area (PA),
a large twinned oikocryst of pigeonite (%3E7
mm across) encloses rounded olivine (%3C=1
mm) and euhedral chromite (%3C=100 micron).
The pigeonite oikocryst has
irregularly-shaped patches of augite usually
along its rim. The oikocryst is
continuously zoned (Ca3Mg76Fe21~Ca11Mg66Fe23)
and augite patches are also zoned
(Ca32Mg52Fe16~Ca37Mg49Fe14) (Fig. 1). It is
noted that Y pyroxenes in PA have almost
identical chemical compositions to those of
ALH and LEW [3,4]. Pyroxene in the
non-poikilitic area (NPA) of Y is pigeonite
that is more Ca-Fe-rich
(Ca7Mg65Fe28~Ca13Mg60Fe27) than that in PA,
and augite has not been detected in NPA
(Fig. 1). A little more Ca-Fe-rich
pigeonite (Ca16Mg58Fe26) observed in LEW
[3,4] is rare in Y. The equilibration
Tags : Meteorite Life Fossils Cyanobacteria Carbonaceous |
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Affichage : 5
Durée : 98 s |
| JMDMT #2500 Microfossils of Cyanobacteria in Carbonaceous Meteorites |
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The James M. DuPont Meteorite Collection - of
augite lamella is out of shape. This
cooling history may correspond to a
prolonged annealing (the first annealing
[1]) which caused pyroxene equilibrium.
Pyroxene initially having the uniform bulk
Ca content of 16 mol% and mg# (=100 x Mg/(Mg
+ Fe)) of 44 begins to exsolve at 1050
degrees C and cools down to 600 degrees C
at a rate of about 0.01 degrees C/yr,
forming an augite lamella about 10
micrometer in width. The best-fit burial
depth is about 800 m in a sheet having a
thermal diffusivity of 0.004 cm2/s, a
typical value for solid rock. For a thermal
diffusivity of 0.0001 cm2/s[5], a value for
regolith-like material, the best-fit burial
depth is about 130 m. The Ca profile of
augite lamellae (Fig. 1) suggests that
Ibitira
Tags : Meteorite Life Fossils Cyanobacteria Carbonaceous |
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Affichage : 10
Durée : 76 s |
| JMDMT #2012 Microfossils of Cyanobacteria in Carbonaceous Meteorites |
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The James M. DuPont Meteorite Collection -
strong affinities to both ALH and LEW in
petrography and mineral chemistry. The Fa
component of Y olivines is more similar to
LEW olivines rather than that of ALH
olivines. The zoning pattern of Y pyroxenes
is almost identical to those of both ALH
and LEW although minor difference is
observed. In these senses, Y has closer
similarity to LEW than ALH in general. The
only difference of Y from both ALH and LEW
is that Y does not contain augite and Ca
phosphates in NPA. Absence of augite in Y
can be explained by earlier onset of
plagioclase than augite in NPA. Although
each meteorite shows slightly different
mineralogy, it seems likely that Y has
originated from the same igneous body or
rock as ALH and LEW. Acknowledgments: We
thank NIPR for the sample. This work was
Tags : Meteorite Life Fossils Cyanobacteria Carbonaceous |
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Affichage : 8
Durée : 80 s |
| JMDMT #2481 Microfossils of Cyanobacteria in Carbonaceous Meteorites |
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The James M. DuPont Meteorite Collection -
Fioretti A. M. Molin G. Petrography and
Mineralogy of FRO 93008 Ureilite: Evidence
for Pairing with FRO 90054 Ureilite Polished
thin sections (PTS) of FRO 93008 and FRO
90054 were examined by optical microscope,
scanning electron microscope, and electron
microprobe as a preliminary part of work on
the cooling history of ureilites. FRO 90054
is a low-C ureilite [1], possibly more
similar to augite-bearing lodranite than to
ureilite [2]. Both samples have an
equigranular, coarse-grained texture, with
silicate grains up to 3 mm. The modal
abundances of FRO 93008 (olivine 39%,
orthopyroxene 32%, augite 21%, metal +
troilite + Fe-hydroxide veins 8%, accessory
schreibersite, and minor pigeonite) are also
similar to those of FRO 90054 (Table 1). No
graphite
Tags : Meteorite Life Fossils Cyanobacteria Carbonaceous |
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Affichage : 10
Durée : 89 s |
| JMDMT #1816 Microfossils of Cyanobacteria in Carbonaceous Meteorites |
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The James M. DuPont Meteorite Collection -
cumulate eucrites [5]. However, the chemical
compositions of all pyroxenes in the PTS
fall on a tie line between Ca2Mg37Fe61 and
Ca44Mg29Fe27 in the pyroxene quadrilateral.
This trend is the same as those of the
ordinary eucrites. Clouding of pyroxenes is
not noticeable. Plagioclase are chemically
zoned from An87 to An90, preserving the
initial crystallization trend. Large
ilmenite crystal with low Cr2O3 and
fine-grained chromite are other minor
minerals. The compositions of chromite are
within the ranges of known ordinary
eucrites. Eucrites with inverted pigeonites
with augite has been designated as type 7
eucrite by Yamaguchi et al. [1]. The
preservation of the recrystallized matrix
texture with secondary augite suggests that
Tags : Meteorite Life Fossils Cyanobacteria Carbonaceous |
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Affichage : 9
Durée : 68 s |
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