Card/Transcription No.: 620-1

620 Minerals from Floor Rubbish (Annexe)

1.
Irregular pieces of bright yellow crystalline material with small
red patches: surface has a pearly lustre.
This is native orpiment (i.e. yellow sulphide of arsenic). The
red is realgar.

2.
Small piece of dull, yellow, amorphous material.
This is yellow ochre.

3.
Small piece of brick-red, amorphous material.
This is red ochre.

4.
Small irregular piece of black material largely coated with brown
& having a few small white patches.
This consists essentially of sand grains cemented together by
black oxide of iron: the brown coating is also oxide of iron and
the tiny white patches are carbonate of lime. The whole suggests
the veins of oxide of iron that occur in the Nubian sandstone.

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