In Memory of Robert Hutchison
1938 - 2007
A rare FeS-rich pallasite
Hambleton - a rare British meteorite from Yorkshire, England
Hambleton is a main group
pallasite, but with some interesting and very unusual anomalies.
Sulphides are abundant - very unusually so for a pallasite. FeS veins have nickel-poor centres and sharply defined nickel-rich rims, inconsistent with alteration, with anywhere up to 60% nickel. Hopes are high that we have a new mineral!!
Hambleton also gives strong support for events during pallasite genesis & evolution - evidence that has previously been sought, but lacking until now.
Abstracts & MetSoc Poster:
Hambleton Abstract #1
Hambleton Abstract #2
Meteoritical Society Meeting 2006 - Hambleton Poster
Analysis & classification (will appear in Meteoriticial Bulletin 91):
Location: Hambleton, North Yorkshire, England
Date found: August 2005
TKW: A single mass weighing 17.6kg
Classification: Stony-Iron (Pallasite-Main Group)
History: A mass of 17.6 kg was found beside a forest track by Rob and Irene Elliott while hunting for meteorites, approx. 2km south of Hambleton, North Yorkshire, England. Physical characteristics: One individual was found. It has a highly weathered exterior with cm-sized patches of blue weathering products. No fusion crust is present.
Petrography (D. Johnson and M. M. Grady, PSSRI, OU; R. Hutchison and C. Kirk, NHM, London). The meteorite is brittle and easily fragments. It contains ~ 60 vol% olivine, Fo88.3, ~25 vol% metal and ~15 vol% sulphide, irregularly distributed. Olivine ranges in size from ~10 mm in fractured, rounded grains that form mosaics in olivine-rich regions, to angular fragments <0.1 mm set in metal or sulphide where these opaques are dominant. The olivine mosaics have metal and/or sulphide veins along grain boundaries or filling fractures. Metal is largely kamacite, commonly as plessitic intergowths with taenite, which also forms thin rims with <60 wt% Ni. Sulphides are abnormally abundant for a pallasite and some regions <5 cm across are composed almost exclusively of troilite, enclosing minor fragmented olivines. Within olivine and metal, sulphides occur as veins, commonly with Ni-poor centres and Ni-rich rims. Chromite and schreibersite are accessory phases. The outer 1 cm of the mass is terrestrially weathered, with veins of Fe oxides and patches of a blue phosphate mineral.
Geochemistry Oxygen isotopic ratios (I. A. Franchi, PSSRI, OU) d17O = +1.383, d18O = +3.029, D17O = -0.187 are typical of a main group pallasite. We hope to have the metal composition data by end of April.. Classification: Main Group Pallasite.
Specimens: Main mass with Rob Elliott, Fernlea Meteorites.A 1 kg sample, 3 slices and 1 thin section, are on deposit at PSSRI, OU.
Two generations of "Catalogue of Meteorites" authors
Profs & Drs Robert Hutchison, Diane Johnson, Monica Grady, Rob Elliott
Dr Diane Johnson and Professor Robert Hutchison
analysing Hambleton on the SEM
The Hambleton area and the White Horse of Kilburn
We drove for half a mile down here and wondered what all the fuss was about.....
.....and then we found out!
Wynd, Milton of Balgonie, Fife. KY7 6PY United Kingdom
Please - no requests to authenticate old rock and stone finds
I've heard the "My grandad saw it fall in a field and gave it to me!" story (and all variations) a zillion times
© Rob Elliott