Difference between revisions of "Almandine"

Latest revision as of 13:48, 10 December 2022

Almandine garnet
MFA# 52.528

Description

almandine

A red Garnet composed of iron aluminum silicate. Almandine can range in color from pale violet to bright red to purplish to brownish black. It was popular as a gem in Roman times and was also commonly found in Egypt. Gemstone quality almandine is mined in Asia Minor, Sri Lanka, Australia, Alaska, Africa, Norway, Sweden, and Japan. It is frequently cut en cabochon then called carbuncle.

Synonyms and Related Terms

almandite; carbuncle; garnet; Ceylon ruby; Syrian garnet; Australian ruby; alabandicus (Pliny); Almandine (Deut.); almandino (Esp.); almandyn (Pol.); almandina (Port.); almandien (Ned.)

IR-ATR of almandine
Image Credit: RRUFF

Raman of almandine
Image Credit: RRUFF

Physical and Chemical Properties

Fracture = conchoidal.
Luster = vitreous to resinous.
Streak = colorless.
Birefringence = none.
Pleochroism = none.
UV fluorescence = inert

Composition	Fe3Al2Si3O12
Mohs Hardness	7.0-7.5
Density	4.05 - 4.3 g/ml
Refractive Index	1.79-1.83
Dispersion	0.024

Comparisons

Properties of Gemstones

Resources and Citations

Gem Identification Lab Manual, Gemological Institute of America, 2016.
Mineralogy Database: Almandine
G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 752
Encyclopedia Britannica, http://www.britannica.com Comment: 'almandine" [Accessed May 8, 2003]
C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
Sue Fuller, Rocks and Minerals, DK Publishing, Inc., New York City, 1995
Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
Wikipedia: http://en.wikipedia.org/wiki/Almandine (accessed June 2004)

@@ Line 1: / Line 1: @@
+[[File:SC296809.jpg|thumb|Almandine garnet<br>MFA# 52.528]]
+== Description ==
 [[File:pa30276almandine2.jpg|thumb|almandine]]
-== Description ==
+A red [[garnet|garnet]] composed of iron aluminum silicate. Almandine can range in color from pale violet to bright red to purplish to brownish black. It was popular as a gem in Roman times and was also commonly found in Egypt. Gemstone quality almandine is mined in Asia Minor, Sri Lanka, Australia, Alaska, Africa, Norway, Sweden, and Japan. It is frequently cut [[cabochon|en cabochon]] then called carbuncle.
-A red [http://cameo.mfa.org/materials/fullrecord.asp?name=garnet garnet] composed of iron aluminum silicate. Almandine can range in color from pale violet to bright red to purplish to brownish black. It was popular as a gem in Roman times and was also commonly found in Egypt. Gemstone quality almandine is mined in Asia Minor, Sri Lanka, Australia, Alaska, Africa, Norway, Sweden, and Japan. It is frequently cut [http://cameo.mfa.org/materials/fullrecord.asp?name=cabochon en cabochon] then called carbuncle.
 == Synonyms and Related Terms ==
@@ Line 8: / Line 8: @@
 almandite; carbuncle; garnet; Ceylon ruby; Syrian garnet; Australian ruby; alabandicus (Pliny); Almandine (Deut.); almandino (Esp.); almandyn (Pol.); almandina (Port.); almandien (Ned.)
-[[[SliderGallery rightalign|almandineRS.jpg~Raman]]]
+[[File:Almandine IR-ATR R040079.png|thumb|IR-ATR of almandine<br>Image Credit: [https://rruff.info/almandine/display=default/R040079 RRUFF]]]
+[[File:Almandine Raman RRUFF R040079.png|thumb|Raman of almandine<br>Image Credit: [https://rruff.info/almandine/display=default/R040079 RRUFF]]]
-== Other Properties ==
+== Physical and Chemical Properties ==
-Fracture = conchoidal.  Luster = vitreous to resinous.  Streak = colorless.  Birefringence = none.  Dispersion = 0.024.  Pleochroism = none.  UV fluorescence = inert
+* Fracture = conchoidal.
+* Luster = vitreous to resinous.
+* Streak = colorless.
+* Birefringence = none.
+* Pleochroism = none.
+* UV fluorescence = inert
 {| class="wikitable"
@@ Line 23: / Line 28: @@
 |-
 ! scope="row"| Density
-| 4.05 - 4.3
+| 4.05 - 4.3 g/ml
 |-
 ! scope="row"| Refractive Index
 | 1.79-1.83
+|-
+! scope="row"| Dispersion
+| 0.024
 |}
-== Additional Information ==
-Mineralogy Database: [http://www.webmineral.com/data/Almandine.shtml Almandine]
 == Comparisons ==
@@ Line 37: / Line 41: @@
 [[media:download_file_395.pdf|Properties of Gemstones]]
+== Resources and Citations ==
+* Gem Identification Lab Manual, Gemological Institute of America, 2016.
-== Authority ==
+* Mineralogy Database: [http://www.webmineral.com/data/Almandine.shtml Almandine]
+* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 752
-* G.S.Brady, G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 752
+* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: 'almandine" [Accessed May 8, 2003]
+* C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979
-* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: 'almandine" from Encyclopdia Britannica Premium Service.   [Accessed May 8, 2003
+* Sue Fuller, ''Rocks and Minerals'', DK Publishing, Inc., New York City, 1995
+* Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982
-* C.W.Chesterman, K.E.Lowe, C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979
+* Wikipedia: http://en.wikipedia.org/wiki/Almandine (accessed June 2004)
-* Sue Fuller, Sue Fuller, ''Rocks and Minerals'', DK Publishing, Inc., New York City, 1995
-* Jack Odgen, Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982
-* Wikipedia, the free encyclopedia, at http://www.wikipedia.com  Comment: http://en.wikipedia.org/wiki/Almandine (accessed June 2004)
 [[Category:Materials database]]