Analcite
Encyclopedia : A : AN : ANA : Analcite
| Analcite | |
|---|---|
| |
| General | |
| Category | Mineral |
| Chemical formula | NaAlSi2O6·H2O |
| Identification | |
| Color | Colorless to white |
| Crystal habit | Typically in crystals, usually trpezohedrons, also massive to granular. |
| Crystal system | Isometric; 4/m bar 3 2/m |
| Cleavage | Absent |
| Fracture | Uneven |
| Mohs Scale hardness | 5 - 5.5 |
| Luster | Vitreous |
| Refractive index | nα=1.479 - 1.493 nγ=1.480 - 1.494 |
| Pleochroism | . |
| Streak | white |
| Specific gravity | 2.27 |
| Fusibility | 3.5 |
| Solubility | . |
| Other Characteristics | . |
Analcite is usually classified as a zeolite mineral, but structurally and chemically it is more similar to the feldspathoids. Analcite occurs as a primary mineral in analcme basalt and other alkaline igneous rocks. Also occurs as cavity and vesicle fillings associated with prehnite, calcite, and zeolites.
Locations include the Cyclopean Islands east off Sicily and near Trentino in northern Italy; Victoria in Australia; Kerguelen Island in the Indian Ocean; in the Lake Superior copper district of Michigan, Bergen Hill, New Jersey, Golden, Colorado in the United States; and at Cape Blomidon, Nova Scotia and Mont Saint-Hilaire, Quebec in Canada; and in Iceland.
See also
References and external links
- Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., ISBN 0471805807
- [Mineral Galleries]
- [Mindat.org]
- [Webmineral.com]
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