Catapleiite
Na2Zr(Si3O9)·2H2OIMA symbol: Ctpgrandfathered
Catapleiite is a silicate mineral with the formula Na2Zr(Si3O9)·2H2O. It has a Mohs hardness of 4, typically black or brown in color, a specific gravity of 2.8.
Photos
Crystallography
| Space group | P b n n |
|---|---|
| Cell (Å, °) | a = 7.378, b = 12.779, c = 10.096; α = 90, β = 90, γ = 90 |
| Cell volume | 951.886 ų, Z = 4 |
| Axial ratios | 0.5774:1:0.7900calculated from COD 9004867 |
| Source structure | COD 9004867 (The Canadian Mineralogist, 2004) — 1 of 2 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 6.39 | 3.961 | 3.046 | 2.978 | 5.399 | 2.7 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 96.5 | 73.5 | 70.4 | 58.2 | 55.6 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004867; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.76 g/cm³calculated from COD 9004867 |
|---|---|
| Hardness (Mohs) | 4single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Specific gravity | 2.8 g/cm3corroboratedFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | black, brownsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Chemistry (calculated)
| Molecular weight | 401.49 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Na 11.45%, Zr 22.72%, Si 20.99%, O 43.84%, H 1% |
Classification
| Nickel-Strunz (10th) | 9.CA.15Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.CA.15Wikidata (CC0) |