Difference between revisions of "Cristobalite"
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== Description == | == Description == | ||
| − | A translucent [ | + | A translucent [[quartz]] mineral named after Cerro San Cristobal, Mexico where it was first identified in 1887. Cristobalite is a natural, refractory material formed in volcanic rock. It can be made synthetically when quartz is heated above 1050 C. Small amounts of cristobalite in a ceramic glaze formula minimize crazing. [[Opal|Opals]] contain masses of microscopic cristobalite crystals. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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cristobalita (Esp.); cristobalite (Fr., Port.) | cristobalita (Esp.); cristobalite (Fr., Port.) | ||
| − | == | + | ==Physical and Chemical Properties== |
| − | Luster=Glassy Streak = white Nonfluorescent | + | * Luster=Glassy |
| + | * Streak = white | ||
| + | * Nonfluorescent | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 23: | Line 25: | ||
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 2.2 | + | | 2.2 g/ml |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| 1.485-1.487 | | 1.485-1.487 | ||
|} | |} | ||
| − | |||
| − | |||
| − | |||
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== Comparisons == | == Comparisons == | ||
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[[media:download_file_455.pdf|Properties of Common Gemstones]] | [[media:download_file_455.pdf|Properties of Common Gemstones]] | ||
| − | + | ==Resources and Citations== | |
| − | + | * WebMinerals: [http://webmineral.com/data/Cristobalite.shtml Cristobalite] | |
| − | == | ||
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 647 | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 647 | ||
Latest revision as of 11:58, 7 July 2022
Description
A translucent Quartz mineral named after Cerro San Cristobal, Mexico where it was first identified in 1887. Cristobalite is a natural, refractory material formed in volcanic rock. It can be made synthetically when quartz is heated above 1050 C. Small amounts of cristobalite in a ceramic glaze formula minimize crazing. Opals contain masses of microscopic cristobalite crystals.
Synonyms and Related Terms
cristobalita (Esp.); cristobalite (Fr., Port.)
Physical and Chemical Properties
- Luster=Glassy
- Streak = white
- Nonfluorescent
| Composition | SiO2 |
|---|---|
| CAS | 14464-46-1 |
| Mohs Hardness | 6.5 |
| Density | 2.2 g/ml |
| Refractive Index | 1.485-1.487 |
Comparisons
Properties of Common Gemstones
Resources and Citations
- WebMinerals: Cristobalite
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 647
- Robert Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Company, Radnor, PA, 1992
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997