Fine Grained Stone
Item: 60.1 Dimensions: 280 x 190 x 9 mm Weight: 1413 g
Partial/complete: Complete slice
Cube: ~15mm x 15mm x 15mm ≈ 15mm3

Estacado

Country: USA
Region: Texas
Found: 1883
Group: Stone
Type: Ordinary Chondrite
Class: H6
Total known weight: 290kg

A stone of 290kg was found in 1883, twelve miles S of Hale Center, M.H.Hey, Cat. Met., 1966, p.156. Described and analyzed (with improbably high alkali concentr.), K.S.Howard and J.M.Davidson, Am. J. Sci., 1906, 22, p.55. Further analysis, 27.88% total Fe, B.Mason and H.B.Wiik, Am. Mus. Novit., 1963, (2154), (M.A.16-639). Porosity and density, K.Keil, Chem. Erde, 1962, 22, p.281; see also, D.T.Britt and G.J.Consolmagno, MAPS, 2003, 38, p.1161. Olivine Fa19, B.Mason, GCA, 1963, 27, p.1011. Structure and composition of plagioclase, W.R.van Schmus and P.H.Ribbe, GCA, 1968, 32, p.1327. TL-data and pre-atmospheric shape, D.W.Sears, Earth Planet. Sci. Lett., 1975, 26, p.97. Oxygen isotopic composition, N.Onuna et al., GCA, 1972, 36, p.157; R.N.Clayton et al., GCA, 1991, 55, p.2317. Oxygen isotopic composition of mineral fractions, R.N.Clayton et al., Earth Planet. Sci. Lett., 1976, 30, p.10. Noble gas abundances in acid-resistant residues, R.K.Moniot, GCA, 1980, 44, p.253. Al-26 depth profile measurement, J.C.Barton et al., GCA, 1982, 46, p.1963. Fission track densities in phosphates, P.Pellas and C.Fi