ðH geocities.com /colleen_lamond/harness.htm geocities.com/colleen_lamond/harness.htm .delayed x RnÔJ ÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÈ P©– 1C OK text/html Övá: 1C ÿÿÿÿ b‰.H Wed, 26 Feb 2003 03:00:22 GMT ® Mozilla/4.5 (compatible; HTTrack 3.0x; Windows 98) en, * QnÔJ 1C
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Beryl |
Corundum |
Diamond |
Quartz |
Chrysoberyl |
Spinel |
|
|
Chem Comp. |
Al2Be3(Si6O18) |
Al2O3 |
C |
SiO2 |
Al2BeO4 |
MgAl2O4 |
|
System |
Hexagonal |
Trigonal |
Cubic |
Trigonal |
Orthorhombic |
Cubic |
|
Hardness |
7.5-8 |
9 |
10 |
7 |
8.5 |
8 |
|
Cleavage |
Imperfect |
None |
Perfect |
None |
Imperfect |
Imperfect |
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Type/Cleave |
|
Octahedral |
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Fracture |
Concoidal |
Concoidal, splintery |
Concoidal, splintery, brittle |
Concoidal |
Conciodal, brittle |
Brittle, concoidal |
|
Habit |
Long prism, rarely tabular |
tabular, short columnar, barrel
shaped |
Octahedron, dodecahedron, cube |
6 sided prism w/pyra termination,
interpentrant twinning, AGG: grainy, fibrous, columnar |
Thick
tabular, |
Octahedral, twinned |
|
Localities |
S. Korea, India, Brazil, Sdakota,
WAustrail, New Hampshire US |
Burma, Thailand, Sri Lanka, |
S Africa, Russia, Namibia,
Austrail. CAN |
Germany, Alps, Brazil, Herkimer,
USA, CAN |
Sri Lanka, Burma, Urals, Brazil
,USA |
Sri Lanka, Burma, Thailand,
Orange County/NY/New Jersey, USA |
|
GARNET
GROUP |
Chem Comp |
System |
Hardness |
Cleavage |
Fracture |
Habit |
Localities |
|
Pyrope |
Mg3Al2(SiO4)3 |
Cubic |
6.5-7.5 |
Imperfect |
Concoidal, brittle, splintery |
Rhombdodecahedron,
icositetrahedron |
Safrica, US, Czecho, Saxony |
|
Almandine |
Fe3Al2(SiO4)3 |
Cubic |
6.5-7.5 |
Imperfect |
Concoidal, brittle, splintery |
Rhombdodecahedron,
icositetrahedron |
Urals, Sri Lanka, India,
Scotland, Norway, NY |
|
Spessartite |
Mn3Al2(SiO4)3 |
Cubic |
6.5-7.5 |
Imperfect |
Concoidal, brittle, splintery |
Rhombdodecahedron,
icositetrahedron |
Germany, Sweden, Madagascar, Sri
Lanka, Burma |
|
Uvarovite |
Ca3Cr2(SiO4)3 |
Cubic |
6.5-7.5 |
Imperfect |
Concoidal, brittle, splintery |
Rhombdodecahedron,
icositetrahedron |
Finland, Urals,
Transvaal/Safrica, Brazil |
|
Grossular |
Ca3Al2(SiO4)3 |
Cubic |
6.5-7.5 |
Imperfect |
Concoidal, brittle, splintery |
Rhombdodecahedron,
icositetrahedron |
Italy, Sri Lanka, Canada, Mexico,
US, Safrica |
|
Andradite |
Ca3Fe2(SiO4)3 |
Cubic |
6.5-7.5 |
Imperfect |
Concoidal, brittle, splintery |
Rhombdodecahedron,
icositetrahedron |
Swiss, Austria |
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