Flint norfolk uk cretaceous teaching education rock, authentic, uk seller

Description

All of our Rocks are 100% Genuine Specimens & come with a Certificate of Authenticity

 

**Please note: Some Rocks maybe propped up for photo purposes**

 

 

 

Specimen: Flint

 

Type: Sedimentary Rock

 

Location: Norfolk

 

 

 

Scale cube=1cm: Full sizing please see photo

 

 

 

Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz, categorized as a variety of chert. It occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones. Inside the nodule, flint is usually dark grey, black, green, white or brown in colour, and often has a glassy or waxy appearance. A thin layer on the outside of the nodules is usually different in colour, typically white and rough in texture. From a petrological point of view, ‘flint’ refers specifically to the form of chert which occurs in chalk or marly limestone. Similarly, ‘common chert’ (sometimes referred to simply as ‘chert’) occurs in limestone.

 

Often, small fossils can be found within the rock. It is formed as a result of some type of diagenesis. Where it occurs in chalk or marl, it is usually called flint.

 

 

 

ACTUAL AS SEEN: The image shows the EXACT specimen you will receive. The specimen has been carefully hand selected and photographed. Measurements are as accurate as possible, though be aware measuring precise dimensions can be difficult from irregular shaped items. Whilst we portray colours as close to life-like as we can, colours will vary if taken in sunlight, indoors, from monitor to monitor and device to device. Once this specimen is sold, we will update this listing with new similar selected item, with a new photo and dimensions.