Plancheite
Cu8(Si4O11)2(OH)4·H2OIMA symbol: Pchredefined
Plancheite is a silicate mineral with the formula Cu8(Si4O11)2(OH)4·H2O, crystallizing in the orthorhombic system. It has typically blue in color, a specific gravity of 3.36-5. Its streak is light blue.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P c n b |
| Cell (Å, °) | a = 19.043, b = 20.129, c = 5.269; α = 90, β = 90, γ = 90 |
| Cell volume | 2019.69 ų, Z = 4 |
| Axial ratios | 0.9460:1:0.2618calculated from COD 9000568 |
| Source structure | COD 9000568 (American Mineralogist, 1977) |
Powder X-ray diffraction (calculated)
| d (Å) | 10.065 | 4.865 | 2.694 | 6.917 | 2.52 | 3.943 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 50.8 | 45 | 43.5 | 30.3 | 30.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9000568; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.831 g/cm³calculated from COD 9000568 |
|---|---|
| Specific gravity | 3.36-5 g/cm3single sourceDana's System, 2nd Appendix (1909) |
| Color | blueDana's System, 2nd Appendix (1909) |
| Streak | light bluesingle sourceWikidata (CC0) |
Chemistry (calculated)
| Molecular weight | 1171.08 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 43.41%, Si 19.19%, O 36.89%, H 0.52% |
Classification
| Nickel-Strunz (10th) | 9.DB.35Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.DB.35Wikidata (CC0) |