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Goalpara meteorite, Assam, India

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Latitude & Longitude (WGS84): 26° 10' North , 90° 36' East
Latitude & Longitude (decimal): 26.16667,90.60000
GeoHash:G#: wh8kvekzv
Locality type:Meteorite Fall Location
Meteorite Class:Ureilite meteorite
Meteoritical Society Class:Ureilite
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:Cwa : Monsoon-influenced humid subtropical climate

Goalpara (India) [1868 Find] A single meteoritic 2.7 kg stone
Classification: Ureilite (Ca-poor achondrite)

A single stone of 2.7 kg was sent by the Rajah of Goalpara to the Calcutta Museum. Goalpara is now known as a ureilite. While by 2013 over 300 ureilite stones have been listed in the Meteoritical Society’s Database, most of them are quite small and/or have been recovered in the 21st Century. Goalpara is actually the most massive of the three known ureilites recovered in the 19th Century. Indeed, Goalpara was the most massive ureilites known before the recovery of the Kenna (New Mexico, USA) ureilite in 1972. Consequently, as small portions of Goalpara have been available in different museums, Goalpara has been around long enough to be the subject of several inquiries.
Ureilites are known for their curious amalgam of cumulate silicates (mostly olivine and pyroxene) mixed with elemental carbon. The carbon itself is always an enigmatic graphite-diamond mix . In Goalpara, four polymorphs of carbon are known (chaoite, diamond, graphite and lonsdaleite). The presence of Lonsdaleite, a hexagonal diamond-like polymorph, may indicate a directional pressure associated with impact shock. The ureilites also usually contain a number of minor opaque minerals. Metallic iron (kamacite) and iron sulfide (as troilite) are invariably present. The ureilites are particularly intriguing because their microscopic textures may have been due to both vapor condensation and to shock impact. Both the relative importance and the timing of these nebular and collisional processes does not appear to be a settled matter at this time.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

8 valid minerals.

Meteorite/Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

Detailed Mineral List:

Formula: C
Reference: Handbook of Mineralogy
Formula: Fe2+Cr3+2O4
Reference: Gennady P. Vdovykin (1970). Ureilites. Space Science Reviews 10, #4, 483-510.
Formula: C
Reference: Gennady P. Vdovykin (1970). Ureilites. Space Science Reviews 10, #4, 483-510.
'Fayalite-Forsterite Series'
Reference: Gennady P. Vdovykin (1970). Ureilites. Space Science Reviews 10, #4, 483-510.
Formula: C
Reference: Gennady P. Vdovykin (1970). Ureilites. Space Science Reviews 10, #4, 483-510.
Formula: Fe
Reference: Gennady P. Vdovykin (1970). Ureilites. Space Science Reviews 10, #4, 483-510.
Iron var: Kamacite
Formula: (Fe,Ni)
Reference: Gennady P. Vdovykin (1970). Ureilites. Space Science Reviews 10, #4, 483-510.
Formula: C
Reference: Gennady P. Vdovykin (1970). Ureilites. Space Science Reviews 10, #4, 483-510.
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Gennady P. Vdovykin (1970). Ureilites. Space Science Reviews 10, #4, 483-510.
Formula: FeS
Reference: Gennady P. Vdovykin (1970). Ureilites. Space Science Reviews 10, #4, 483-510.
'Ureilite meteorite'
Reference: Meteoritical Society Database

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
var: Kamacite1.AE.05(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides
Group 9 - Silicates
Unclassified Minerals, Rocks, etc.
'Fayalite-Forsterite Series'-
Ureilite meteorite-

List of minerals arranged by Dana 8th Edition classification

Metals, other than the Platinum Group
var: Kamacite,Ni)
Semi-metals and non-metals
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Unclassified Minerals, Rocks, etc.
'Fayalite-Forsterite Series'-
'Ureilite meteorite'-

List of minerals for each chemical element

C ChaoiteC
C DiamondC
C GraphiteC
C LonsdaleiteC
O ChromiteFe2+Cr23+O4
O Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
S TroiliteFeS
Ca Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Cr ChromiteFe2+Cr23+O4
Fe ChromiteFe2+Cr23+O4
Fe IronFe
Fe Iron (var: Kamacite)(Fe,Ni)
Fe Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe TroiliteFeS
Ni Iron (var: Kamacite)(Fe,Ni)

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

2.588 - 23.03 Ma

ID: 3185708
Cenozoic sedimentary rocks

Age: Neogene (2.588 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
John L. Berkley, G. Jeffrey Taylor, Klaus Keil, George E. Harlow & Martin Prinz (1980). The nature and origin of ureilites. G&CA 44, #10, 1579-1697.
Monica M. Grady (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
S. J. Singletary & T. L. Grove (2003) Early petrologic processes on the ureilite parent body. Meteoritics & Planetary Science 38, #1, 95-108. (Jan 2003).
Gennady P. Vdovykin (1970). Ureilites. Space Science Reviews 10, #4, 483-510.

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