Barytocalcite
BaCa(CO3)2IMA symbol: Bcalgrandfathered
Barytocalcite is a carbonate or nitrate mineral with the formula BaCa(CO3)2, crystallizing in the monoclinic system. It has a Mohs hardness of 4, typically white, gray, green or yellow in color, with a resinous or vitreous luster, a specific gravity of 3.64-3.66. Its streak is white.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/m 1 |
| Cell (Å, °) | a = 8.092, b = 5.2344, c = 6.544; α = 90, β = 106.05, γ = 90 |
| Cell volume | 266.378 ų, Z = 2 |
| Axial ratios | 1.5459:1:1.2502calculated from COD 9013465 |
| Source structure | COD 9013465 (Journal of Research of the National Bureau of Standards - Physics and Chemistry, 1971) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.121 | 4.023 | 3.144 | 2.158 | 2.511 | 4.339 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 43.7 | 41.8 | 27.6 | 27.5 | 22.6 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9013465; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.708 g/cm³calculated from COD 9013465 |
|---|---|
| Hardness (Mohs) | 4single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.64-3.66 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, green, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | resinous, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 297.42 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ba 46.17%, Ca 13.48%, C 8.08%, O 32.28% |
Classification
| Nickel-Strunz (10th) | 5.AB.45Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 5.AB.45Wikidata (CC0) |