Anisotropy in the track development properties of various crystallographic planes of natural quartz crystals

1976 ◽  
Vol 30 (3) ◽  
pp. 159-165 ◽  
Author(s):  
Hameed Ahmed Khan ◽  
Ishfaq Ahmad
Keyword(s):  
Natural Quartz ◽  
Quartz Crystals ◽  
Crystallographic Planes

Sector zoning of trace elements and oxygen isotopes in natural quartz crystals

2006 ◽  
Vol 70 (18) ◽  
pp. A298 ◽  
Author(s):  
A.-L. Jourdan ◽  
T.W. Vennemann ◽  
J. Mullis ◽  
K. Ramseyer
Keyword(s):  
Trace Elements ◽  
Oxygen Isotopes ◽  
Natural Quartz ◽  
Quartz Crystals ◽  
Sector Zoning

Preparation of Synthetic Quartz Aggregates under Pressure

1991 ◽  
Vol 251 ◽  
Author(s):  
F. C. Luan ◽  
M. S. Paterson
Keyword(s):  
High Temperature ◽  
Crack Propagation ◽  
Creep Strength ◽  
Natural Quartz ◽  
Quartz Crystals ◽  
Synthetic Quartz ◽  
Self Diffusion ◽  
Hydrolytic Process ◽  
Quartz Aggregates ◽  
Strong Contrast

ABSTRACTIn 1965 Griggs and Blacic [1,2] proposed that there is a “hydrolytic weakening” process in quartz and silicates whereby the breaking of Si-O bonds, involved in the movement of dislocations, is facilitated by the presence of water. This proposal aimed to explain the observed dramatic weakening of quartz crystals when they are exposed to water in tests at high temperature, as well as the observed strong contrast in creep strength between dry natural quartz crystals and rapidly-grown synthetic quartz crystals containing traces of water. Such a “hydrolytic” process may also underlie the observed effects of water in accelerating other phenomena such as self-diffusion of oxygen in quartz, aluminium-silicon ordering in feldspars, slow crack propagation in silicates, and recrystallization in quartz. A review of this field is given in Reference 3.

A trapped-hole center causing rose coloration of natural quartz

1983 ◽  
Vol 163 (3-4) ◽  
Author(s):  
D. Maschmeyer ◽  
G. Lehmann
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Hole Center ◽  
Natural Quartz ◽  
Paramagnetic Resonance ◽  
Quartz Crystals ◽  
Electron Paramagnetic ◽  
Hyperfine Structures ◽  
Hole Centers

AbstractIn rose-colored natural quartz crystals two new hole centers were detected and analyzed by electron paramagnetic resonance (EPR). A hole center with characteristic doublet and sextet hyperfine structures was identified as an O

Distribution of OH in synthetic and natural quartz crystals

1976 ◽  
Vol 17 (3) ◽  
pp. 305-311 ◽  
Author(s):  
Dipak Chakraborty ◽  
Gerhard Lehmann
Keyword(s):  
Natural Quartz ◽  
Quartz Crystals
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