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Medicine Lake Volcano - Wikipedia, the free encyclopedia
Medicine Lake Volcano is a large shield volcano in northeastern California about 50 kilometers (30 mi) northeast of Mount Shasta. The volcano is located in a zone of east-west crustal extension east of the main axis of the Cascade Volcanic Arc and the Cascade Range. The 1-kilometer (0.6 mi) thick shield is 35 km (22 mi) from east to west and 45 to 50 km (28 to 31 mi) from north to south, and covers more than 2,000 km2 (770 sq mi). The underlying rock has downwarped by 0.5 km (0.3 mi) under the center of the volcano. The volcano is primarily composed of basalt and basaltic andesite lava flows, and has a 7 km × 12 km (4.3 mi × 7.5 mi) caldera at the center.
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coating the volcano's sides with flow after flow of basaltic lava
Obsidian - Wikipedia, the free encyclopedia
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools without crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) induces a high viscosity and polymerization degree of the lava. The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth. Because of the lack of crystal structure, obsidian blade edges can reach almost molecular thinness, leading to its ancient use as projectile points, and its modern use as surgical scalpel blades.[1]
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Like all glass and some other types of naturally occurring rocks, obsidian breaks with a characteristic conchoidal fracture.
Glass - Wikipedia, the free encyclopedia
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Add Sticky NoteThe amorphous structure of glassy Silica (SiO2). No long range order is present, however there is local ordering with respect to the tetrahedral arrangement of Oxygen (O) atoms around the Silicon (Si) atoms.
- can order be perm lost through evap temps? does this lead to inevitable stress reactions? - on 2009-06-12
Introduction to Quasicrystals
This page is meant to be an introduction to the field of Quasicrystals in order to educate the interested reader on some basic concepts in this relatively new branch of Crystallography. The more advanced reader may proceed to other sites and sources on quasicrystals.
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- "icosahedral" quasicrystal with
broken symmetry (stable binary Cd5.7Yb)
new type (reported in Nature, Nov.2000)
- "icosahedral" quasicrystal with
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Below there is a simulation for a Laue
pattern (X-ray) from an icosahedral quasicrystal, whereby
the x-ray beam is along one of the five-fold axes. - 2 more annotations...
Glass: Liquid or Solid -- Science vs. an Urban Legend
Abstract
I compiled this short article to address the widespread urban legend according to which glass is a liquid. It consists chiefly of a selection of quotes from recent works by specialists in materials science which state unambiguously that glasses are amorphous solids. I also speculate that at the origin of the legend may have been a misreading/mistranslation of an influential paper by Gustav Tamman. Additionally, I appended to the article an extract from an ASTM method of discriminating between a liquid and a solid.
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although there seem to have been no statistical
studies that document the frequency and magnitudes of such
variations. -
Note that some physicists do not accept plasma as a distinct
fourth state of aggregation, while others propose more than four
states. It has been suggested that glasses form a distinct state
of aggregation, the vitreous state. This proposition has been
generally ignored (see Gutzow and Schmelzer,
1995). - 4 more annotations...
Experimental thermoelectric power of liquid silver-germanium alloys interpreted with an analytical energy-dependent calculation
The absolute thermoelectric power of liquid Ag-Ge alloys has been measured as a function of temperature over the whole phase diagram in 10 at. % steps, from the liquidus to 1150°C.
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liquidus to 1150°C
SpringerLink - Journal Article
E. A. Beloborodova
Abstract We present the results of a calorimetric investigation of the enthalpies of mixing in Ge-Zr and Ge-Nb systems at 1973 K in the range 0 to 22 at.%. We show that alloy formation in these systems is accompanied by a large exothermic effect. This is connected with the large influence of binary intermetallic compounds in the Ge-Zr and Ge-Nb systems.
Silver Facts - Periodic Table of the Elements
Discovery: Known since prehistoric time. Man learned to separate silver from lead as early as 3000 B.C.
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Latin argentum meaning 'silver'
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melting point of silver is 961.93°C, boiling point is 2212°C, specific gravity is 10.50 (20°C), with a valence of 1 or 2.
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Germanium dioxide - Wikipedia, the free encyclopedia
Germanium dioxide, also called germanium oxide and germania, is an inorganic compound, an oxide of germanium. Its chemical formula is GeO2. Its other names are germanic acid, G-15, and ACC10380. It forms as a passivation layer on pure germanium in contact with atmospheric oxygen.
Periodic Table of Elements: Boron – B (EnvironmentalChemistry.com)
Comprehensive data on the chemical element Boron is provided on this page; including scores of properties, element names in many languages, most known nuclides of Boron. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one studies. Using the "Periodic Table of Elements Quick Navigation" graphic at the bottom of the sidebar menu, one can quickly jump from chemical element to chemical element.
ScienceDirect - Journal of Alloys and Compounds : SAXS study of barium borosilicate glasses containing ThO2
This increase in sizes is probably due to the agglomeration of smaller particles occurring leading to the phase separation of crystallites from BBS matrix noticed in the earlier study.
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Add Sticky NoteThis increase in sizes is probably due to the agglomeration of smaller particles occurring leading to the phase separation of crystallites from BBS matrix noticed in the earlier study.
- Otherwise known as 'growing'. - on 2009-06-12
Synthesis and crystal structure of a new samarium borosilicate compound Sm3BSi2O10
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The structure is composed of two types of anion: (BSi1O6)5− and (Si2O4)4− independently forming isolated layers arranged alternately along the c axis direction. These isolated layers are interconnected through rare earth ions Sm1, Sm2, Sm3 to form a three-dimensional network structure.
What is Borosilicate Glass?
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at least five percent boric oxide
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resistance to chemical corrosion
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Global Glassworks
We welcome you friend!
Here at Global Glassworks we are driven by our experiences throughout the world. There is always a deep connection with our work whether single retail items, mass marketed wholesale pieces or museum quality works. When you buy a Global Glassworks product you're not just buying a new pendant or ring, you're bringing home a piece of inspiration that has traveled the globe to reach you!
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Add Sticky Note
- Welcome to Global Glassworks!
We are Diigo friendly! - on 2009-06-11
- Welcome to Global Glassworks!
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