60315 (74) Poikilitic Impact Melt
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Fact sheet

60315 (74) Poikilitic Impact Melt

60315 is holocrystalline and dense (almost igneous), but contains significant siderophile content and relict anorthite xenocrysts indicating that it is a recrystallized impact melt. It has a poilkilitic texture composed of a mesh of relatively large oikocrysts of orthopyroxene which enclose abundant laths and clasts of plagioclase, rare olivine, pink spinel (rotation 1) and opaques. Augite, olivine, ilmenite and armalcolite rim some pyroxene oikocrysts and/or make up the interstices between oikocrysts. The oikocryst boundaries are best seen between crossed polars. Metallic iron is also present. Rounded vesicles are common.

The sample weighed 787 grams before analysis and has recently been dated at 3.868±0.031 billion years (Ar/Ar).

Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/

[Siderophile - an element with a weak affinity for oxygen and sulphur and that is readily soluble in molten iron; includes iron, nickel, cobalt]

About this collection

Sample details

Rock-forming mineral
Accessory minerals
metallic iron
Category guide  
Category Guide
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Accessory minerals
Minerals that occur in very low abundance in a rock. They are usually not visible with the naked eye and contribute perhapssver, they often dominate the rare elements such as platinum group metals.
Rock-forming minerals
Minerals that make up the bulk of all rock samples and are also the ones used in rock classi?cation.
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A term used to group together related samples that are not already gathered into a single Collection. For instance, there is a ‘SW England granites’ theme that includes such rock types as granite, hydrothermal breccia, skarn and vein samples.
A general term used to label a rock sample. It is a useful way of grouping similar samples throughout a collection. Category names are often, but not exclusively, common rock names (e.g. granite, basalt, dolerite, gabbro, greisen, skarn, gneiss, amphibolite, limestone, sandstone).
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We would like to thank the following for the use of this sample: