Bavenite
Ca4Be2+xAl2-xSi9O26-x(OH)2+x (x = 0 to 1)IMA symbol: Bvnredefined
Bavenite is a silicate mineral with the formula Ca4Be2+xAl2-xSi9O26-x(OH)2+x (x = 0 to 1), crystallizing in the orthorhombic system. It has a Mohs hardness of 5.5, typically white or gray in color, a specific gravity of 2.7. Its streak is white.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | C m c m |
| Cell (Å, °) | a = 23.208, b = 4.9833, c = 19.4266; α = 90, β = 90, γ = 90 |
| Cell volume | 2246.73 ų, Z = 4 |
| Axial ratios | 4.6572:1:3.8983calculated from COD 9017553 |
| Source structure | COD 9017553 (Mineralogical Magazine, 2011) — 1 of 27 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.346 | 3.724 | 4.189 | 3.396 | 3.038 | 3.206 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 45.3 | 32.4 | 29.3 | 23.1 | 20 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9017553; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.718 g/cm³calculated from COD 9017553 |
|---|---|
| Hardness (Mohs) | 5.5single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Specific gravity | 2.7 g/cm3corroboratedFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | gray, whitesingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Streak | whitesingle sourceWikidata (CC0) |
Classification
| Nickel-Strunz (10th) | 9.DF.25Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.DF.25Wikidata (CC0) |
| Dana (8th) | 70.5.3.1Wikidata (CC0) |