RCIN and OZwRCIN projects


Chocolate' flint : 2D documentation

Resource type:



Chocolate' flint : 2D documentation

Type of object:

Geological sample

Archaelogical site:

Wierzbica 'Zele'

Location- administrative unit (present):

Wierzbica, Radom district, Mazowsze province, Poland

Topographic location:

northeastern edging of Świętokrzyskie Mountains

See the map:

51º14’ N 21º03’ E

Object type:

siliceous rocks ; flint

Characteristics of the object- technique:

core technique

Characteristics of the object- raw material:

Upper Jurassic flint (Upper Oxford)

Characteristics of the object- colour:

10 YR 2/1 10 YR 3/2, 10 YR 3/10

Characteristics of the object- transparency:

0 - non - transparent

Characteristics of the object- fracture:


Characteristics of the object- texture/facture:

silica matrix mostly very homogenous in texture; nonhomogenous inside the concretion: black middle part of the concretion (10 YR 2/1), the size of this part in comparison to the rest of the concretion may differ very much; the black core is surrounded by dark grey mass (10 YR 3/10) or very dark grey-brown mass (10 YR 3/2), the division between the colours of the core and the surrounding mass is very clear

Characteristics of the object- luster:


Characteristics of the object- cortex:

thin under 1 mm, rough

Characteristics of the object- transition:

clear transition

Characteristics of the object- patina:


Characteristics of the object- colour of patine:


Characteristics of the object- width:

65 mm

Characteristics of the object- thickness:

31 mm

Characteristics of the object- length:

91 mm

Characteristics of the object- weight:

167,5 g

Object description:

First characteristics of chocolate flint containing an attempt to determine distinct features of flint "Zele" type from Wierzbica mine was given by R. Schild (1971). There were three levels of occurrence of flint concretions at the Wierzbica „Zele” site. They occurr in two types – as large plates and as nodule-like concretions. Raw material extracted at Wierzbica „Zele” site differs from other similar varieties of chocolate flint by weaker lustre and the occurrence of clear demarcation between black and brown chocolate colour in the flint mass of some part of concretions

Research Manager/ Creator of Collection:

Werra, Dagmara H.

Accession number:



Upper Jurassic


Atlas skał

Detailed Resource Type:

Research data

Resource Identifier:



Creative Commons Attribution BY-SA 3.0 PL license

Terms of use:

Copyright-protected material. [CC BY-SA 3.0 PL] May be used within the scope specified in Creative Commons Attribution BY-SA 3.0 PL license, full text available at: ; -

Digitizing institution:

Institute of Archaeology and Ethnology of the Polish Academy of Sciences

Original in:

Institute of Archaeology and Ethnology of the Polish Academy of Sciences

Projects co-financed by:

Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget. ; European Union. European Regional Development Fund



Object collections:

Last modified:

Jul 27, 2022

In our library since:

May 31, 2021

Number of object content downloads / hits:


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Edition name Date
Krzemień czekoladowy : dokumentacja [2D] Jul 27, 2022


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