Albertite is a variety of

asphalt Asphalt, also known as bitumen (, ), is a sticky, black, highly viscous liquid or semi-solid form of petroleum. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term a ...

found in the Albert Formation in

Albert County, New Brunswick Albert County (2016 population 29,158) is New Brunswick's third-youngest county located on the Western side of the Petitcodiac River on the Chignecto Bay in the Bay of Fundy. Prior to the abolition of county government in 1967, the shire town w ...

, and in a deposit at

Dingwall Dingwall ( sco, Dingwal, gd, Inbhir Pheofharain ) is a town and a royal burgh in the Highland council area of Scotland. It has a population of 5,491. It was an east-coast harbour that now lies inland. Dingwall Castle was once the biggest cast ...

, in the north-east of Scotland. It is a type of solid

hydrocarbon In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons are examples of group 14 hydrides. Hydrocarbons are generally colourless and hydrophobic, and their odors are usually weak or ex ...

. Albertite has a black colour, a resinous luster, and a

hardness In materials science, hardness (antonym: softness) is a measure of the resistance to localized plastic deformation induced by either mechanical indentation or abrasion. In general, different materials differ in their hardness; for example hard ...

of 2½. It is less soluble in

turpentine Turpentine (which is also called spirit of turpentine, oil of turpentine, terebenthene, terebinthine and (colloquially) turps) is a fluid obtained by the distillation of resin harvested from living trees, mainly pines. Mainly used as a special ...

than the usual type of asphalt. It was from a mixture of albertite and pitch that

kerosene Kerosene, paraffin, or lamp oil is a combustible hydrocarbon liquid which is derived from petroleum. It is widely used as a fuel in aviation as well as households. Its name derives from el, κηρός (''keros'') meaning "wax", and was regi ...

was first distilled in 1846 by

Abraham Gesner Abraham Pineo Gesner, ONB (; May 2, 1797 – April 29, 1864) was a Canadian physician and geologist who invented kerosene. Gesner was born in Cornwallis, Nova Scotia (now called Chipmans Corner) and lived much of his life in Saint John, New Bru ...

, a

New Brunswick New Brunswick (french: Nouveau-Brunswick, , locally ) is one of the thirteen provinces and territories of Canada. It is one of the three Maritime provinces and one of the four Atlantic provinces. It is the only province with both English and ...

geologist who had heard stories of rocks that burned in the area and gave the material its first scientific study.

Origin

Albertite is formed from

oil shale Oil shale is an organic-rich fine-grained sedimentary rock containing kerogen (a solid mixture of organic chemical compounds) from which liquid hydrocarbons can be produced. In addition to kerogen, general composition of oil shales constitute ...

in which some of the hydrocarbons have been remobilised as liquid

. The process is as follows: * Crude oil (petroleum) is produced from source rocks (in the case of Albert Mines, oil shale). * The petroleum migrates through fractures and becomes trapped in the apex of an

anticline In structural geology, an anticline is a type of fold that is an arch-like shape and has its oldest beds at its core, whereas a syncline is the inverse of an anticline. A typical anticline is convex up in which the hinge or crest is the ...

. * The lighter oils gradually leak out through the weakly permeable

caprock Caprock or cap rock is a more resistant rock type overlying a less resistant rock type,Kearey, Philip (2001). ''Dictionary of Geology'', 2nd ed., Penguin Reference, London, New York, etc., p. 41.. . analogous to an upper crust on a cake that is har ...

. * The bituminous residues (tars, asphaltanes, etc.) are left behind in the fractures as albertite.

Occurrence

Albertite is named after Albert County in New Brunswick, Canada, where it was first found in the area that became known as Albert Mines. There, the albertite occurs as discordant, cross-cutting

veins Veins are blood vessels in humans and most other animals that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated b ...

in the core of an anticline. It was initially mistaken for

coal Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is formed when dea ...

. Most geologists of the 1800s were puzzled by how this "coal" came to be discordant to the local

strata In geology and related fields, a stratum ( : strata) is a layer of rock or sediment characterized by certain lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible surfaces known as ei ...

, as they did not understand the nature of its

source rock In petroleum geology, source rock is rock which has generated hydrocarbons or which could generate hydrocarbons. Source rocks are one of the necessary elements of a working petroleum system. They are organic-rich sediments that may have been depos ...

, or the fact that the albertite was essentially solidified

asphaltum Asphaltite (also known as uintahite, asphaltum, gilsonite or oil sands) is a naturally occurring soluble solid hydrocarbon, a form of asphalt (or bitumen) with a relatively high melting temperature. Its large-scale production occurs in the Uintah ...

. Extraterrestrial Albertite has also been detected on the dwarf planet

Ceres Ceres most commonly refers to: * Ceres (dwarf planet), the largest asteroid * Ceres (mythology), the Roman goddess of agriculture Ceres may also refer to: Places Brazil * Ceres, Goiás, Brazil * Ceres Microregion, in north-central Goiás ...

References

{{reflist

External links

Albertite occurrences, Albert Mines

Asphaltic substances in Turkey; their physical properties
Petroleum industry in Canada Oil shale in Canada Oil shale geology Bitumen-impregnated rocks