Analcime
Na(AlSi2O6)·H2OIMA symbol: Anlapproved
Analcime is a silicate mineral with the formula Na(AlSi2O6)·H2O, crystallizing in the orthorhombic system. It has a Mohs hardness of 5.5-5.596, typically colorless, white, gray or green in color, with a vitreous luster, a specific gravity of 2.22-2.29. Its streak is white.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | I 41/a c d :2 |
| Cell (Å, °) | a = 13.7295, b = 13.7295, c = 13.7036; α = 90, β = 90, γ = 90 |
| Cell volume | 2583.12 ų, Z = 8 |
| Axial ratios | 1.0000:1:0.9981calculated from COD 9002000 |
| Source structure | COD 9002000 (American Mineralogist, 1999) — 1 of 23 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.432 | 5.603 | 2.925 | 5.598 | 3.426 | 2.926 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 61.2 | 53.7 | 38.3 | 36.4 | 20.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9002000; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.238 g/cm³calculated from COD 9002000 |
|---|---|
| Hardness (Mohs) | 5.5-5.596single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.22-2.29 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | colorless, gray, green, red, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 220.15 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Na 10.44%, Al 12.26%, Si 25.51%, O 50.87%, H 0.92% |
Classification
| Nickel-Strunz (10th) | 9.GB.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.GB.05Wikidata (CC0) |
| Dana (8th) | 77.1.1.1Wikidata (CC0) |