Laurion - Minerals in Ancient SlagsLaurion

Laurion:

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Fluorite, see belowSample photographs

All photographs taken by Piet van Kalmthout using the Wild Macroscope M420 and an Olympus OM2 camera.

The magnification factor is indicated by giving the size of the original view in mm. The minerals were determined on the basis of visual inspection as well as X-ray and chemical analysis.

 

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Diaboleite  Pb2Cu2+Cl2(OH)4 ,
tet.; indigo blue.

Irregularly formed aggregate of pyramidal diaboleite crystals. Generally pyramidal diaboleite is found as solitary crystals.

3.4 * 2.3 mm; found in Passa Limani.

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Diaboleite  Pb2Cu2+Cl2(OH)4 ,
tet.; azure-blue.

Quite large (0.7 mm) Diaboleite crystal, semi-translucent. Distinctive growth lines inside the cystal.

0.9 * 0.6 mm; found in Passa Limani.

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Diaboleite  Pb2Cu2+Cl2(OH)4 ,
tet.; blue, blue-green, semi-translucent.

Exceptionally shaped slender diabolite crystal with an azure blue free-lying acute summit. Transition to a green colour in the middle. Bright cross striation.

1.3 * 0.9 mm; found in Thorikos.

Fluorite  CaF2 ,
cub.; colourless, milky white, semi-transparent.

Botryoidal formed crystals may assume highly improbable shapes.

2.3 * 1.5 mm; found in Passa Limani.

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Comments welcome!
Piet van Kalmthout