Difference between revisions of "Whewellite"

Latest revision as of 12:13, 9 December 2022

Whewellite
Image credit: RRUFF

Description

A white to colorless mineral composed of Calcium oxalate monohydrate. Whewellite is formed on the surface of Marble and Limestone due to the presence of microorganisms, such as Lichen.

Synonyms and Related Terms

calcium oxalate monohydrate; calcium salt of ethanedioic acid; wewelita (Esp.); whewelite (Port.); Whewellit (Deut.)

IR-ATR (RRUFF)

Raman (RRUFF)

Chemical structure

Risks

Fisher Scientific: MSDS

Physical and Chemical Properties

Soluble in dilute mineral acids. Insoluble in water, acetic acid.
Slightly hygroscopic.
Transparent to translucent tabular crystals with good cleavage in all three planes.
Luster=vitreous to pearly.
Streak = white.
Fluorescent in UV light.

Composition	Ca(C2O4)-H2O
CAS	5794-28-5
Mohs Hardness	2.5-3.0
Density	2.2 g/ml
Molecular Weight	mol. wt. = 146.11

Resources and Citations

Mineralogy Database: Whewellite

M. del Monte, C. Sabbioni, G.Zappia. The origin of calcium oxalates on historical buildings, monuments and natural outcrops. The science of the total environment 67, (1987), pp. 17-39

B. Ford, I.MacLeod, P.Haydock, "Rock art pigments from Kimberley region of Western Australia: identification of the minerals and conversion mechanisms." Studies in conservation 39, no. 1 (1994), pp. 57-69

Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997

Wikipedia,: http://en.wikipedia.org/wiki/Whewellite (Accessed Nov. 29, 2005)

@@ Line 1: / Line 1: @@
+[[File:Whewellite R050526 Sample Photo 1513 M.jpg|thumb|Whewellite<br>Image credit: [https://rruff.info/whewellite/R050240 RRUFF]]]
 == Description ==
-A white to colorless mineral composed of [http://cameo.mfa.org/materials/fullrecord.asp?name=calcium%20oxalate calcium oxalate] monohydrate. Whewellite is formed on the surface of [http://cameo.mfa.org/materials/fullrecord.asp?name=marble marble] and [http://cameo.mfa.org/materials/fullrecord.asp?name=limestone limestone] due to the presence of microorganisms, such as [http://cameo.mfa.org/materials/fullrecord.asp?name=lichen lichen].
+A white to colorless mineral composed of [[calcium%20oxalate|calcium oxalate]] monohydrate. Whewellite is formed on the surface of [[marble|marble]] and [[limestone|limestone]] due to the presence of microorganisms, such as [[lichen|lichen]].
 == Synonyms and Related Terms ==
@@ Line 7: / Line 8: @@
 calcium oxalate monohydrate; calcium salt of ethanedioic acid; wewelita (Esp.); whewelite (Port.); Whewellit (Deut.)
-[[[SliderGallery rightalign|whewellite.jpg~Chemical structure]]]
+[[[SliderGallery rightalign|Whewellite IR-ATR RRUFF R050526.png~IR-ATR (RRUFF)|Whewellite Raman RRUFF R050526.png~Raman (RRUFF)|whewellite.jpg~Chemical structure]]]
+== Risks ==
-== Other Properties ==
+* Fisher Scientific: [https://fscimage.fishersci.com/msds/80705.htm MSDS]
-Soluble in dilute mineral acids. Insoluble in water, acetic acid. Slightly hygroscopic.
+==Physical and Chemical Properties==
-Transparent to translucent tabular crystals with good cleavage in all three planes.
+* Soluble in dilute mineral acids. Insoluble in water, acetic acid.
+* Slightly hygroscopic.
-Luster=vitreous to pearly.  Streak = white.  Fluorescent in UV light.
+* Transparent to translucent tabular crystals with good cleavage in all three planes.
+* Luster=vitreous to pearly.
+* Streak = white.
+* Fluorescent in UV light.
 {| class="wikitable"
@@ Line 29: / Line 34: @@
 |-
 ! scope="row"| Density
-| 2.2
+| 2.2 g/ml
 |-
 ! scope="row"| Molecular Weight
@@ Line 35: / Line 40: @@
 |}
-== Hazards and Safety ==
+==Resources and Citations==
-Fisher Scientific: [https://fscimage.fishersci.com/msds/80705.htm MSDS]
+*  Mineralogy Database: [http://www.webmineral.com/data/Whewellite.shtml Whewellite]
-== Additional Information ==
+* M. del Monte, C. Sabbioni, G.Zappia. The origin of calcium oxalates on historical buildings, monuments and natural outcrops. The science of the total environment 67, (1987), pp. 17-39
-° Mineralogy Database: [http://www.webmineral.com/data/Whewellite.shtml Whewellite]° M. del Monte, C. Sabbioni, G.Zappia. The origin of calcium oxalates on historical buildings, monuments and natural outcrops. The science of the total environment 67, (1987), pp. 17-39 ° B. Ford, I.MacLeod, P.Haydock, "Rock art pigments from Kimberley region of Western Australia: identification of the minerals and conversion mechanisms." ''Studies in conservation'' 39, no. 1 (1994), pp. 57-69
+* B. Ford, I.MacLeod, P.Haydock, "Rock art pigments from Kimberley region of Western Australia: identification of the minerals and conversion mechanisms." ''Studies in conservation'' 39, no. 1 (1994), pp. 57-69
-== Sources Checked for Data in Record ==
 * Random House, ''Webster's Encyclopedic Unabridged Dictionary of the English Language'', Grammercy Book, New York, 1997
-* External source or communication  Comment: B. Ford, I.MacLeodand P.Haydock, "Rock art pigments from Kimberley region of Western Australia: identification of the minerals and conversion mechanisms."  ''Studies in conservation'' 39, no. 1 (1994), pp. 57-69
+* Wikipedia,: http://en.wikipedia.org/wiki/Whewellite (Accessed Nov. 29, 2005)
-* Wikipedia, the free encyclopedia, at http://www.wikipedia.com  Comment: http://en.wikipedia.org/wiki/Whewellite (Accessed Nov. 29, 2005)
 [[Category:Materials database]]