Difference between revisions of "Antigorite"
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serpentine; antigorita (Esp.); antigorite (Port.); Antigorit (Deut.); antigoriet (Ned.) | serpentine; antigorita (Esp.); antigorite (Port.); Antigorit (Deut.); antigoriet (Ned.) | ||
| − | + | [[[SliderGallery rightalign|Antigorite.TIF~FTIR (MFA)|antigoliteRS.jpg~Raman (RASMIN)]]] | |
| − | [[[SliderGallery rightalign|Antigorite.TIF~FTIR (MFA)|antigoliteRS.jpg~Raman]]] | ||
== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
| − | Monoclinic | + | * Monoclinic, crystals rare, usually massive |
| + | * Cleavage = almost perfect | ||
| + | * Fracture = conchoidal | ||
| + | * Luster = vitreous, silky, greasy | ||
| + | * Streak = white, greenish-white | ||
| + | * Low birefringence | ||
| + | * May be translucent to opaque | ||
| + | * Translucent stones may show black inclusions, white veining, or moss-like shapes | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 20: | Line 26: | ||
|- | |- | ||
! scope="row"| Mohs Hardness | ! scope="row"| Mohs Hardness | ||
| − | | 3 - | + | | 3.5 - 4.0 |
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| 2.5-2.6 g/ml | | 2.5-2.6 g/ml | ||
| + | |- | ||
| + | ! scope="row"| Refractive index | ||
| + | | 1.56-1.57 | ||
|} | |} | ||
==Resources and Citations== | ==Resources and Citations== | ||
* Mindat.org: [https://www.mindat.org/min-260.html antigorite] | * Mindat.org: [https://www.mindat.org/min-260.html antigorite] | ||
| − | + | * Gem Identification Lab Manual, Gemological Institute of America, 2016. | |
* Thomas Gregory, ''The Condensed Chemical Dictionary'', Reinhold Publishing, New York, 3rd ed., 1942 | * Thomas Gregory, ''The Condensed Chemical Dictionary'', Reinhold Publishing, New York, 3rd ed., 1942 | ||
| − | |||
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 702 | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 702 | ||
| − | |||
* B.Ford et al, Studies in Conservation, vol 39, pp. 57-69. for formula | * B.Ford et al, Studies in Conservation, vol 39, pp. 57-69. for formula | ||
| − | + | * Wikipedia: [https://en.wikipedia.org/wiki/Antigorite Antigorite] [Accessed Aug. 30 2005 and Dec 2022] | |
| − | * Wikipedia: | ||
[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 10:10, 5 January 2023
Description
A variety of Serpentine named after the community of Antigorio in Italy. Antigorite was was first described and named for a specimen from the Antigorio valley in the Novara province of Italy.
Synonyms and Related Terms
serpentine; antigorita (Esp.); antigorite (Port.); Antigorit (Deut.); antigoriet (Ned.)
Physical and Chemical Properties
- Monoclinic, crystals rare, usually massive
- Cleavage = almost perfect
- Fracture = conchoidal
- Luster = vitreous, silky, greasy
- Streak = white, greenish-white
- Low birefringence
- May be translucent to opaque
- Translucent stones may show black inclusions, white veining, or moss-like shapes
| Composition | Mg3Si2O5(OH)4 |
|---|---|
| Mohs Hardness | 3.5 - 4.0 |
| Density | 2.5-2.6 g/ml |
| Refractive index | 1.56-1.57 |
Resources and Citations
- Mindat.org: antigorite
- Gem Identification Lab Manual, Gemological Institute of America, 2016.
- Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 702
- B.Ford et al, Studies in Conservation, vol 39, pp. 57-69. for formula
- Wikipedia: Antigorite [Accessed Aug. 30 2005 and Dec 2022]