10 LIVRES EN ANGLAIS EN RAPPORT AVEC «PYRITOHEDRAL»
Découvrez l'usage de
pyritohedral dans la sélection bibliographique suivante. Des livres en rapport avec
pyritohedral et de courts extraits de ceux-ci pour replacer dans son contexte son utilisation littéraire.
1
U.S. Geological Survey Professional Paper
The pyrite of the ores, if well crystallized, is commonly cubical or pyritohedral in
form; octahedral crystals of pyrite were observed only in one mine, the Rooks
County, between Apex and Tolland. On the octahedral pyrite crystals are
implanted ...
2
Geological Survey Professional Paper
Most ferro- magnesian minerals and plagioclase argillized ; pyritohedral pyrite 74
-82 Clay, silt, and sand, blue-gray, with pyrite 82-92 Clay, sand, and gravel as
large as 2 in., rounded to subrounded. Granitic, metamorphic, and andesitic
debris ...
3
Geology and Ore Deposits of the Little Hatchet Mountains, ...
The distinct crystals disseminated in the gangue all seem to be cubes with
octahedral and pyritohedral modifications. With the probable exception of
arsenopyrite and molybdenite this pyrite was the earliest sulfide deposited in the
veins of the ...
Samuel Grossman Lasky, 1947
4
Geological Survey Professional Paper
The distinct crystals disseminated in the gangue all seem to be cubes with
octahedral and pyritohedral modifications. With the probable exception of
arsenopyrite and molybdenite this pyrite was the earliest sulfide deposited in the
veins of the ...
Geological Survey (U.S.), 1947
5
Pyrite Oxidation and Its Control
(1978) reported that pyrite occurred as acicular forms, coarse-grained masses,
euhedral forms, framboidal and polyframboidal forms, and octahedral and
pyritohedral crystals (Figure 4.1). They also reported that pyrite isolated from
lignite coal ...
6
Current Topics in Chinese Science: Earth science
Cubic "spheroids", 2. octahedral "spheroids", S. pyritohedral "spheroids", 4.
compound pyritohedral "spheroids", 5. compound octahedral "spheroids". Size of
spheroids 00 Fig. 3. Frequency distribution of size of "spheroids". 1. "Spheroids" ...
7
Geology and Ore Deposits of the San Francisco and Adjacent ...
Usually it is without definite crystal form, but in the Cactus deposit many well-
formed pyritohedral crystals are seen. Much of the pyrite in the highly silicified
rock of the Horn Silver deposit occurs in well-formed octahedral crystals; in the
more ...
Bert Sylvenus Butler, 1913
8
Professional Paper - United States Geological Survey
Behind this lining of cubes, at a distance of 1 to 2 inches, occurs a zone of
smaller imperfect crystals which show pyritohedral forms, striated by twinning
with the cube. Vugs in this zone contain clusters of quartz crystals; but the reason
for this ...
Geological Survey (U.S.), 1905
9
Applied Geometry and Discrete Mathematics: The Victor Klee ...
For instance, when q = 2 , the former is the pyritohedral group [3+ , 4] S Ql4 x €2 ,
as we have seen, while the latter is the octahedral group [3, 4]+ A 64 [10, p. 134].
In contrast, the two subgroups (2, 3, 8; 5) and (2, 3, 10; 4) of G3'8'10, which are ...
Peter Gritzmann, Bernd Sturmfels, Victor Klee
10
A Field Guide to Rocks and Minerals
Distinguishing characteristics: The tin-white color, coupled with the cubic or
pyritohedral crystal form, is unmistakable. Co- baltite is harder and has a less
perfect cleavage than galena. It is historically rare. Occurrence: An insignificant
ore of ...
Frederick H. Pough, Roger Tory Peterson, 1996
ACTUALITÉS CONTENANT LE TERME «PYRITOHEDRAL»
Découvrez de quoi on parle dans les médias nationaux et internationaux et comment le terme
pyritohedral est employé dans le contexte des actualités suivantes.
Collecting Microminerals in the Creede Mining District
Pyrite was common on the dumps in the 1970s as bright botryoids and masses several centimeters across, with some showing pyritohedral crystals to 6 mm. «RedOrbit, sept 08»
