Gold & Silver - Stone - Materials - Draenert
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Gold & Silver

The close-up view of each stone type shows a relatively true image of the crystalline structure and the colouring. This is suitable for grained slabs to a limited extend only. In regard to the colour matching, please take an original sample of the stone from your furniture store as a basis.

Petrography

The main mineral is coarse grain, yellowish to ivory-coloured alkaline feldspar. In not so coarse aggregates, transparent, colourless quartz appears which reaches a proportion of approximately 30%. Deep-black biotite mica forms an intensive contrast with its typical leaf-like crystal form. Yellowish-brown, irregular limonite fronts run through the rock. The result is a peasant, warm shade. 

Petrogenesis

Most of the pegmatite consists of approximately the same mineral components as granite. Its generation is also tightly connected with that of granite. After granite magma slowly hardened and crystallised in the deeper areas of the earth crust, residual melts circulated in the appearing cooling-down fissures. These melts are very much liquid because of their high contents of dissolved water vapour and other constituents, due to which very large crystal grains can often form when cooling down. Some pegmatite deposits did not gain any greater importance as a stone to work with, but because of containing precious stones.

Hardness Hard Stone
Structure Type Slab with Irregular Pattern
Synonyms
Group Plutonic rock - Plutonite
Petrographic Assignment Gneiss - Pegmatite
Age > 570 million years (Pre-Cambrian)
Colouring Minerals Ivory to crème-coloured feldspar, colourless quartz, black biotite, auburn limonite veins
Average Hardness 6-7 (according to Mohs’s hardness scale 1-10)
Deposit Brazil