PAROLE IN INGLESE ASSOCIATE CON «TRIDYMITE»
tridymite
formation
cristobalite
tridymite
high
temperature
polymorph
quartz
usually
occurs
minute
tabular
white
colorless
pseudo
hexagonal
crystals
scales
cavities
felsic
volcanic
rocks
chemical
formula
first
described
type
location
hidalgo
mexico
name
mineral
information
data
frequently
both
commensurately
incommensurately
modulated
structure
variants
known
stabilised
very
small
dollase
baur
american
mineralogist
superstructure
meteoritic
solved
computer
simulation
pictures
rare
however
distinct
form
different
habits
many
specimens
silicon
dioxide
gallery
meaning
that
composed
same
chemistry
encyclopedia
britannica
silica
stable
temperatures
between
lower
rruff
c○
publishing
version
orthorhombic
pseudohexagonal
triclinic
below
about
point
10 LIBRI IN INGLESE ASSOCIATI CON «TRIDYMITE»
Scopri l'uso di
tridymite nella seguente selezione bibliografica. Libri associati con
tridymite e piccoli estratti per contestualizzare il loro uso nella letteratura.
1
An Introduction to Mineral Sciences
Nevertheless, the basic geometry of the dimensional relationships between
tridymite and cristobalite remains the same as that between hexagonal and cubic
close- packed structures as described in Section 5.2.1. Despite these similarities
in ...
193: 573 C 870 C 1470 C 1705 C 2477 C x-quurtz < ' /^-quartz < ' /f-tridymite < ' /^
-cristobalite c ' melt i ' vapor (trigonal) (hexagonal) (hexagonal) (cubic) 117° 270°
temperature 1550°C Cvp. Cvp. melt. stable phase metastable phase At 1705 C ...
Egon Wiberg, Nils Wiberg, 2001
3
Origin of Granite in the Light of Experimental Studies in ...
Results of quenching experiments on the efiect of pressure on the quartz~
tridymite inversion 312153;“? Taggin— P “Sine Tim e Result Quartz 885 2000 2
days Tridymite Tridymite 885 2000 2 days Tridymite Quartz 870 2000 2 days
Quartz ...
4
The Potter's Dictionary of Materials and Techniques
The potter may meet with another phase of silica called tridymite. Tridymite is a
complex phase having two major subdivisions and nine minor subdivisions
called forms. Quartz converts to tridymite between 870°C and 1470°C (1598°F
and ...
Frank Hamer, Janet Hamer, 2004
The monoclinic polymorph a-tridymite is stable at temperatures below 870°C (
Smith 1998). At temperatures between 870°C and 1470°C it is hexagonal a-
tridymite. Tridymite is only meta- stable at normal surface temperatures tending to
alter, ...
Ken Donaldson, Paul Borm, 2006
6
Petrology: Igneous, Sedimentary, and Metamorphic
At low pressures, the silica mineral can be either tridymite or cristo- balite; at
higher pressures (above about 2 kbar; see Figure 5-1), it is normally quartz. This
system is a useful one to examine because it is important petrologically and
because ...
Harvey Blatt, Robert J. Tracy, Brent Owens, 2006
7
Thermodynamic Properties Of Individual Substances: Elements ...
The thermodynamic functions of tridymite at temperatures of 100-1953 K are
given in Table 446. The values of the constants adopted for calculating the
thermodynamic functions are given in Table 16.1. At T < 298.15 K the
calculations were ...
L. V. Gurvich, I. Veyts, 1990
8
Local Structure from Diffraction
TRIDYMITE Crystal structure and disorder The crystal structure of tridymite,
another polymorph of silica, is very similar to that of cristobalite, in that the two
materials are made from sheets of tetrahedra linked in a hexagonal array. In
cristobalite ...
simon Billinge, M.F. Thorpe, 1998
3.51 Textural development in tridymite-cordierite-fayalite paralava (a–c) (redrawn
from Fig. 5 of Sen Gupta 1957), and tridymite-mullite- cordierite paralava (d, e) (
redrawn from Fig. 4 of Sen Gupta 1957). The sequence of crystallisation in both ...
10
Clays and Ceramic Raw Materials
Like cristobalite, tridymite also undergoes a series of inversions, though it is by
no means universally accepted as a pure silica phase. Some authorities maintain
that there are two distinct varieties of tridymite, known as 'S' and 'M'; the latter ...
10 NOTIZIE DOVE SI INCLUDE IL TERMINE «TRIDYMITE»
Vedi di che si parla nei media nazionali e internazionali e come viene utilizzato il termine ino
tridymite nel contesto delle seguenti notizie.
Association asks for input on silica dust code of practice
Cristobalite and tridymite are two other forms. All three may become breathable-sized particles when workers chip, cut, drill or grind objects that contain ... «Journal of Commerce, ott 14»
What is Crystalline Silica? And What Are the Associated Hazards?
Its most common form is Quartz, although it is also found in the lesser known Cristobalite and Tridymite. During the fracking process Crystalline Silica is ... «International Environmental Technology, set 14»
OSHA proposes new standard for workplace silica exposure
The new rule would cover all three forms of crystalline silica: quartz, cristobalite, and tridymite. The proposed rule also sets an “action level” of 25 micrograms per ... «Lexology, apr 14»
OSHA proposal is causing a bit of a dustup
Two other types of silica, cristobalite and tridymite, have limits that are half of that. The proposed rule drastically would cut the allowable limit to 50 µg/m3 for all of ... «Crain's Cleveland Business, apr 14»
Reducing silica dust risk by adopting right workplace safety measures
Quartz is the most common form of crystalline silica. Cristobalite and tridymite are two other forms of crystalline silica. All three forms may become respirable size ... «Business Standard, dic 13»
OSHA finally releases proposed new rule on silica exposure
OSHA proposes to have the new rule cover all three forms of crystalline silica, quartz, cristobalite, and tridymite. The rule includes new requirements for ... «Lexology, set 13»
OSHA Announces New Proposed Rule to Protect Workers from …
EMSL Analytical provides testing services for crystalline silica, including alpha-quartz, cristobalite, tridymite and amorphous silica. WEBWIRE – Monday, August ... «WebWire, ago 13»
An Introduction to Tridymite and Its Uses
Tridymite is a silica mineral (SiO2), which is not only precious to collectors but also useful in scientific analyses. The crystals of this rare and unique mineral are ... «Azomining, lug 13»
Space Bling: From Diamond Planets to Crystal Oceans to Precious …
The crystals, called cristobalite and tridymite, swim in clouds around stars just before they begin to form planets. These particular crystals require flash heating ... «Daily Beast, ott 12»
X-Ray Diffraction (XRD) – Analysis of Silica (SiO2) Dust by Bruker AXS
X-ray powder diffraction is capable of distinguishing polymorphs of crystalline silica (quartz, cristobalite, tridymite). Furthermore, XRD may account for the ... «Azom.com, mar 10»
