Huntite CaMg3 (CO3 )4 IMA symbol: Hun grandfathered
Huntite is a carbonate or nitrate mineral with the formula CaMg3(CO3)4, crystallizing in the trigonal system. It has a calculated density of 2.875 g/cm3. Its streak is white.
Crystallography Crystal system trigonal crystal systemWikidata (CC0) Space group R 3 2 :H Cell (Å, °) a = 9.5027, b = 9.5027, c = 7.8212; α = 90, β = 90, γ = 120 Cell volume 611.6 ų, Z = 3 Axial ratios 1.0000:1:0.8231calculated from COD 1000052 Source structure COD 1000052 (American Mineralogist, 1986) — 1 of 3 structures
Powder X-ray diffraction (calculated) 2θ (degrees, Cu Kα1) I/I₀ (max 100) d (Å) 2.835 1.971 2.89 1.766 1.756 1.584 I/I₀ 100 24.9 18.7 17.1 16 11
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 1000052; idealized occupancies, no preferred orientation.
Physical properties Density (calculated) 2.875 g/cm³calculated from COD 1000052 Streak whitesingle source Wikidata (CC0)
Chemistry (calculated) Molecular weight 353.03 g/molcalculated from the IMA formula Composition (wt%) Ca 11.35%, Mg 20.65%, C 13.61%, O 54.38%
Classification Nickel-Strunz (10th) 5.AB.25Wikidata (CC0) Nickel-Strunz (9th) 5.AB.25Wikidata (CC0)
