High Possil Meteorite
Encyclopedia
The High Possil meteorite fell on the morning of Thursday, 5 April 1804, in a quarry near High Possil, on the northern outskirts of Glasgow
Glasgow
Glasgow is the largest city in Scotland and third most populous in the United Kingdom. The city is situated on the River Clyde in the country's west central lowlands...

. The High Possil meteorite is one of only four ever to have been found in Scotland
Scotland
Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

 - the others being the Perth meteorite of 1830, and the Strathmore meteorite, which fell in Perthshire
Perthshire
Perthshire, officially the County of Perth , is a registration county in central Scotland. It extends from Strathmore in the east, to the Pass of Drumochter in the north, Rannoch Moor and Ben Lui in the west, and Aberfoyle in the south...

 in 1917 of the 1,998 fragments of a stony meteorite reported from a field near Glenrothes
Glenrothes
Glenrothes is a large town situated in the heart of Fife, in east-central Scotland. It is located approximately from both Edinburgh, which lies to the south and Dundee to the north. The town had an estimated population of 38,750 in 2008, making Glenrothes the third largest settlement in Fife...

 in Fife
Fife
Fife is a council area and former county of Scotland. It is situated between the Firth of Tay and the Firth of Forth, with inland boundaries to Perth and Kinross and Clackmannanshire...

, although this is known to be an older fall, as they are very weathered. The High Possil meteorite was one of a number of falls around the beginning of the 19th century, which were witnessed, recovered and investigated thoroughly. The 1795 Wold Cottage fall in Yorkshire
Yorkshire
Yorkshire is a historic county of northern England and the largest in the United Kingdom. Because of its great size in comparison to other English counties, functions have been increasingly undertaken over time by its subdivisions, which have also been subject to periodic reform...

, 1803 L'Aigle
L'Aigle
L'Aigle is a commune in the Orne department in Basse-Normandie in north-western France.This commune used to be known as Laigle. According to Orderic Vitalis, the nest of an eagle was discovered during the construction of the castle....

 fall in France
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

, and the 1804 High Possil fall could perhaps be said to mark the beginning of modern meteorite science. Although meteorite falls are rare everywhere, Scotland seems to have "escaped" unexpectedy lightly from such bombardment - over 18 falls are known from England
England
England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 and Wales
Wales
Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

. This effect may be more apparent than real, as much of Scotland is only sparsely populated, and the results of any unseen falls would rapidly become untraceable in the extensive tracts of mountain, bog, loch and forest. High Possil is a stony meteorite, classified as an L6
L chondrite
The L type ordinary chondrites are the second most common type of meteorite, accounting for approximately 35% of all those catalogued, and 40% of the ordinary chondrites....

 ordinary chondrite
Ordinary chondrite
The Ordinary chondrites are a class of stony chondritic meteorites. They are by far the most numerous group and comprise about 87% of all finds...

 - a very common type. The Hunterian Specimen, GLAHM M172, now weighs about 151g, and is the largest surviving piece of the meteorite. Although extraterrestrial in origin, the High Possil meteorite is mostly made up of minerals which also occur on earth. The major constituents are similar to those of a basalt
Basalt
Basalt is a common extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria. Unweathered basalt is black or grey...

: orthopyroxene, olivine
Olivine
The mineral olivine is a magnesium iron silicate with the formula 2SiO4. It is a common mineral in the Earth's subsurface but weathers quickly on the surface....

, plagioclase feldspar
Feldspar
Feldspars are a group of rock-forming tectosilicate minerals which make up as much as 60% of the Earth's crust....

 and diopside
Diopside
Diopside is a monoclinic pyroxene mineral with composition MgCaSi2O6. It forms complete solid solution series with hedenbergite and augite, and partial solid solutions with orthopyroxene and pigeonite. It forms variably colored, but typically dull green crystals in the monoclinic prismatic class...

. About 9% of the meteorite consists of nickel
Nickel
Nickel is a chemical element with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel belongs to the transition metals and is hard and ductile...

-iron
Iron
Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust...

 alloy
Alloy
An alloy is a mixture or metallic solid solution composed of two or more elements. Complete solid solution alloys give single solid phase microstructure, while partial solutions give two or more phases that may or may not be homogeneous in distribution, depending on thermal history...

s, with traces of other minerals such as troilite
Troilite
Troilite is a rare iron sulfide mineral with the simple formula of FeS. It is the iron rich endmember of the pyrrhotite group. Pyrrhotite has the formula FeS which is iron deficient...

, whitlockite
Whitlockite
Whitlockite is a mineral, an unusual form of calcium phosphate. Its formula is Ca96PO3OH. It is a relatively rare mineral but is found in granitic pegmatites, phosphate rock deposits, guano caves and in chondrite meteorites...

, chromite
Chromite
Chromite is an iron chromium oxide: FeCr2O4. It is an oxide mineral belonging to the spinel group. Magnesium can substitute for iron in variable amounts as it forms a solid solution with magnesiochromite ; substitution of aluminium occurs leading to hercynite .-Occurrence:Chromite is found in...

 and copper
Copper
Copper is a chemical element with the symbol Cu and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; an exposed surface has a reddish-orange tarnish...

.
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