Mordenite
(Na2,Ca,K2)4(Al8Si40)O96·28H2OIMA symbol: Morapproved
Mordenite is a silicate mineral with the formula (Na2,Ca,K2)4(Al8Si40)O96·28H2O, crystallizing in the orthorhombic system. It has a Mohs hardness of 3-4, typically white, pink or yellow in color, with a pearly or silky luster, a specific gravity of 2.08. Its streak is white.
Photos
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Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | C m c 21 |
| Cell (Å, °) | a = 18.096, b = 20.473, c = 7.515; α = 90, β = 90, γ = 90 |
| Cell volume | 2784.15 ų, Z = 4 |
| Axial ratios | 0.8839:1:0.3671calculated from COD 9003354 |
| Source structure | COD 9003354 (American Mineralogist, 2004) — 1 of 8 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.47 | 9.048 | 3.994 | 3.22 | 3.388 | 13.559 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 75.4 | 64.8 | 63.9 | 62.9 | 60.3 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9003354; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.094 g/cm³calculated from COD 9003354 |
|---|---|
| Hardness (Mohs) | 3-4single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.08 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | pink, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | pearly, silky, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 9.GD.35Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.GD.35Wikidata (CC0) |