Gaylussite
Na2Ca(CO3)2·5H2OIMA symbol: Gylgrandfathered
Gaylussite is a carbonate or nitrate mineral with the formula Na2Ca(CO3)2·5H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 2-3, typically white or yellow in color, with a vitreous luster, a specific gravity of 1.93-1.95. Its streak is gray or red.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/c 1 |
| Cell (Å, °) | a = 14.361, b = 7.781, c = 11.209; α = 90, β = 127.84, γ = 90 |
| Cell volume | 989.154 ų, Z = 4 |
| Axial ratios | 1.8456:1:1.4406calculated from COD 9009890 |
| Source structure | COD 9009890 (Inorganic Chemistry, 1969) |
Powder X-ray diffraction (calculated)
| d (Å) | 3.208 | 2.638 | 2.728 | 6.416 | 2.511 | 2.697 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 74.9 | 74.1 | 66.1 | 44.1 | 35.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9009890; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 1.989 g/cm³calculated from COD 9009890 |
|---|---|
| Hardness (Mohs) | 2-3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 1.93-1.95 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) gray, redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 296.15 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Na 15.53%, Ca 13.53%, C 8.11%, O 59.43%, H 3.4% |
Classification
| Nickel-Strunz (10th) | 5.CB.35Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 5.CB.35Wikidata (CC0) |