Amicite
K2Na2(Al4Si4O16)·5H2OIMA symbol: Amiapproved
Amicite is a silicate mineral with the formula K2Na2(Al4Si4O16)·5H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 4.5, a calculated density of 2.173 g/cm3. Its streak is white.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | I 1 2 1 |
| Cell (Å, °) | a = 10.226, b = 10.422, c = 9.884; α = 90, β = 88.19, γ = 90 |
| Cell volume | 1052.86 ų, Z = 4 |
| Axial ratios | 0.9812:1:0.9484calculated from COD 9007633 |
| Source structure | COD 9007633 (Acta Crystallographica, Section B, 1979) — 1 of 2 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 4.225 | 2.721 | 3.14 | 7.297 | 5.11 | 2.704 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 93.9 | 86.1 | 76.3 | 63.2 | 62.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9007633; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.173 g/cm³calculated from COD 9007633 |
|---|---|
| Hardness (Mohs) | 4.5single sourceWikidata (CC0) |
| Streak | whitesingle sourceWikidata (CC0) |
Chemistry (calculated)
| Molecular weight | 690.51 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | K 11.32%, Na 6.66%, Al 15.63%, Si 16.27%, O 48.66%, H 1.46% |
Classification
| Nickel-Strunz (10th) | 9.GC.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.GC.05Wikidata (CC0) |