Difference between revisions of "Erythrite"
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eritrite (Port.); cobalt bloom; erythrine; peach blossom ore; cobaltous arsenate; light cobalt violet | eritrite (Port.); cobalt bloom; erythrine; peach blossom ore; cobaltous arsenate; light cobalt violet | ||
| − | == | + | == Risks == |
| − | + | * Highly toxic by ingestion and inhalation. | |
| − | + | ==Physical and Chemical Properties== | |
| − | Luster = vitreous to pearly. Streak = pale red to pink | + | * Soluble in dilute mineral acids and ammonium hydroxide. Insoluble in water. |
| − | + | * Monoclinic crystals. | |
| − | Under crossed polars, crystals are highly birefringent | + | * Perfect cleavage in one direction. |
| + | * Luster = vitreous to pearly. | ||
| + | * Streak = pale red to pink | ||
| + | * Under crossed polars, crystals are highly birefringent | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 26: | Line 29: | ||
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 2.91-2.95 | + | | 2.91-2.95 g/ml |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| Line 32: | Line 35: | ||
|} | |} | ||
| − | == | + | ==Resources and Citations== |
| − | |||
| − | |||
| − | |||
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| − | |||
| − | + | * Mineralogy Database: [http://www.webmineral.com/data/Erythrite.shtml Erythrite] | |
* Nicholas Eastaugh, Valentine Walsh, Tracey Chaplin, Ruth Siddall, ''Pigment Compendium'', Elsevier Butterworth-Heinemann, Oxford, 2004 | * Nicholas Eastaugh, Valentine Walsh, Tracey Chaplin, Ruth Siddall, ''Pigment Compendium'', Elsevier Butterworth-Heinemann, Oxford, 2004 | ||
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* C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 | * C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 | ||
| − | * Wikipedia | + | * Wikipedia: http://en.wikipedia.org/wiki/Erythrite (Accessed Jan. 15, 2006) |
* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976 | * ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976 | ||
Latest revision as of 13:13, 5 August 2022
Description
A natural hydrated cobalt arsenate mineral. Erythrite occurs in deposits in Morocco (Bou Azzer), Germany (Saxony), Canada (Ontario), Mexico (Sonora). and the U.S. (Idaho). The pink to violet mineral was used as a pigment in paints, glass, and ceramics.
Synonyms and Related Terms
eritrite (Port.); cobalt bloom; erythrine; peach blossom ore; cobaltous arsenate; light cobalt violet
Risks
- Highly toxic by ingestion and inhalation.
Physical and Chemical Properties
- Soluble in dilute mineral acids and ammonium hydroxide. Insoluble in water.
- Monoclinic crystals.
- Perfect cleavage in one direction.
- Luster = vitreous to pearly.
- Streak = pale red to pink
- Under crossed polars, crystals are highly birefringent
| Composition | CO3(As4)2.8H2O |
|---|---|
| Mohs Hardness | 1.5 - 2.0 |
| Density | 2.91-2.95 g/ml |
| Refractive Index | 1.626-1.701 |
Resources and Citations
- Mineralogy Database: Erythrite
- Nicholas Eastaugh, Valentine Walsh, Tracey Chaplin, Ruth Siddall, Pigment Compendium, Elsevier Butterworth-Heinemann, Oxford, 2004
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 206
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2495
- 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/Erythrite (Accessed Jan. 15, 2006)
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998