H/L4
Found August 1975
40° 27.4' N., 102° 34.7' W.
A 15.53 kg stone was found by Mr. Pat Kain 21 km SSE of Haxtun, Colorado while he was plowing a wheat field. The three mineralogical classification parameters yield three different group assignments: olivine (Fa = 21.6) suggests H/L; low-Ca pyroxene (Fs = 17.8) suggests H; and cobalt in kamacite (7.5 mg/g) suggests L. Haxtun shares this intermediate, equilibrated H/L4 classification with Yamato 74645. Haxtun is highly weathered and belongs to shock stage S4. Besides Haxtun and Y-74645, very few meteorites have been assigned to this intermediate group, including Tieschitz (H/L3.6), Bremervörde (H/L3.9), NWA 1955 (H/L3–4), and Yamato 8424 (H/L). Initial studies indicate that Dhofar 008 may also belong to this group. The specimen of Haxtun shown above is a 4.9 g slice.
