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Beach Sand, Sri Lanka

                                          

Bentota beach

 

Garnet sand

Location:

Bentota River area, SW Sri Lanka

Provenance:

High grade metamorphic rocks of the south indian craton

Composition:

Transparent pink garnet, metallic black cassiterite, ilmenite, rutile, prismatic-elongate zirconia

Petrographic thin section:

In the bright field transparent pink
garnets with characteristic high relief,
opaque cassiterite, ilmenite and rutile.
In the dark field the garnets appear
black, the few prismatic-elongated
zirconia with high relief are transparent

Bright field

 

Dark field

Texture:

Medium sand (ca. 400 µ), well to moderately sorted, angular (garnet) to subangular (cassiterite)

Sample number

Collector

Date of sampling

heubeck0052

Hettiavatilu

1979

Comments:

A heavy minerals placer, characteristic for erosion products of high grade metamorphic rocks of S India in tropic climate and under intense chemical weathering

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