Some physical properties of silica minerals
- Some physical properties of silica minerals
-
Some physical properties of silica minerals
phase symmetry specific gravity hardness
● quartz
● (alpha-quartz)
● hexagonal;
● trigonal
● trapezohedral
2.651 7
● high quartz
● (beta-quartz)
● hexagonal;
● hexagonal
● trapezohedral
2.53 at 600 degrees Celsius 7
low tridymite monoclinic? 2.26 7
high tridymite orthorhombic 2.20 at 200 degrees Celsius 7?
low cristobalite tetragonal 2.32 6–7
high cristobalite isometric 2.20 at 500 degrees Celsius 6–7
keatite tetragonal 2.50 ?
coesite monoclinic 2.93 7.5
stishovite tetragonal 4.28 ?
vitreous silica amorphous 2.203 6
opal
● poorly
● crystalline or
● amorphous
1.99–2.05 5 1/2–6 1/2
See as table:
* * *
Universalium.
2010.
Look at other dictionaries:
silica mineral — Any of the forms of silicon dioxide (SiO2), including quartz, tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony. Various kinds of silica minerals have been produced synthetically. * * * Introduction… … Universalium
Properties of water — H2O and HOH redirect here. For other uses, see H2O (disambiguation) and HOH (disambiguation). This article is about the physical and chemical properties of pure water. For general discussion and its distribution and importance in life, see Water … Wikipedia
Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… … Universalium
Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… … Universalium
Soda-lime glass — Soda lime glass, also called soda lime silica glass, is the most prevalent type of glass, used for windowpanes, and glass containers (bottles and jars) for beverages, food, and some commodity items. Also Pyrex brand kitchen glassware manufactured … Wikipedia
Silicon dioxide — Silica redirects here. For other uses, see Silica (disambiguation). Silicon dioxide … Wikipedia
sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… … Universalium
chemical element — Introduction also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed. This article considers the… … Universalium
Geology of Mars — Mars Mars as seen by the Hubble Space Telescope Designations … Wikipedia
Silicon — Not to be confused with the silicon containing synthetic polymer silicone. aluminium ← silicon → phosphorus C ↑ Si ↓ Ge … Wikipedia
