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| කුරුවින්ද | |
|---|---|
 | |
| General | |
| Category | Oxide mineral – Hematite group |
| , Al2O3 | |
| 04.CB.05 | |
| Dana classification | 4.3.1.1 |
| Trigonal (32/m) | |
| a = 4.75 Å, c = 12.982 Å; Z=6 | |
| Identification | |
| පාට / පැහැය | Colorless, gray, brown; pink to pigeon-blood-red, orange, yellow, green, blue to cornflower blue, violet; may be color zoned, asteriated mainly grey and brown |
| Steep bipyramidal, tabular, prismatic, rhombohedral crystals, massive or granular | |
| (Hexagonal Scalenohedral) Symbol (32/m) : R3c | |
| Polysynthetic twinning common | |
| None – parting in 3 directions | |
| Conchoidal to uneven | |
| hardness | 9 (defining mineral) |
| Adamantine to vitreous | |
| White | |
| Transparent, to | |
| 3.95–4.10 | |
| Optical properties | Uniaxial (–) |
| nω = 1.767–1.772 nε = 1.759–1.763 | |
| None | |
| 2044 °C | |
| Infusible | |
| Insoluble | |
| Alters to | May alter to mica on surfaces causing a decrease in hardness |
| Other characteristics | May fluoresce or phosphoresce under UV |
| References | |
| Major varieties | |
| Any color except red | |
| Red | |
| Black granular corundum intimately mixed with , , or | |
වර්ග
- "Moh's scale of hardness". Collector's corner. Mineralogical Society of America. සම්ප්රවේශය 10 January 2014.
- Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W. and Nichols, Monte C., ed. (1997). "Corundum". Handbook of Mineralogy (PDF). Vol. III(Halides, Hydroxides, Oxides). Chantilly, VA, US: Mineralogical Society of America. ISBN .
{{}}: CS1 maint: multiple names: editors list () - Corundum. Mindat.org
- Corundum. Webmineral
- Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., Wiley, pp. 300–302
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ක ර ව න දGeneralCategoryOxide mineral Hematite group Al2O304 CB 05Dana classification4 3 1 1Trigonal 3 2 m a 4 75 A c 12 982 A Z 6Identificationප ට ප හ යColorless gray brown pink to pigeon blood red orange yellow green blue to cornflower blue violet may be color zoned asteriated mainly grey and brownSteep bipyramidal tabular prismatic rhombohedral crystals massive or granular Hexagonal Scalenohedral Symbol 3 2 m R3 cPolysynthetic twinning commonNone parting in 3 directionsConchoidal to unevenhardness9 defining mineral Adamantine to vitreousWhiteTransparent to3 95 4 10Optical propertiesUniaxial nw 1 767 1 772 ne 1 759 1 763None2044 CInfusibleInsolubleAlters toMay alter to mica on surfaces causing a decrease in hardnessOther characteristicsMay fluoresce or phosphoresce under UVReferencesMajor varietiesAny color except redRedBlack granular corundum intimately mixed with orවර ගන ල ම ණ ක රත ක ට පද මර ග ප ෂ පර ග Moh s scale of hardness Collector s corner Mineralogical Society of America සම ප රව ශය 10 January 2014 Anthony John W Bideaux Richard A Bladh Kenneth W and Nichols Monte C ed 1997 Corundum Handbook of Mineralogy PDF Vol III Halides Hydroxides Oxides Chantilly VA US Mineralogical Society of America ISBN 0962209724 a href wiki E0 B7 83 E0 B7 90 E0 B6 9A E0 B7 92 E0 B6 BD E0 B7 8A E0 B6 BD Cite book class mw redirect title ස ක ල ල Cite book cite book a CS1 maint multiple names editors list link Corundum Mindat org Corundum Webmineral Hurlbut Cornelius S Klein Cornelis 1985 Manual of Mineralogy 20th ed Wiley pp 300 302 ISBN 0 471 80580 7