1. رواسب البيجماتيت Pegmatite deposits
Pegmatite deposits are typically small in tonnage but high grade and form pods, veins and irregular bodies.
They are the principal source of many rare metals, especially the rare alkali metals (Li, Rb, Cs) and (W, Mo, Sn, Th, U, Ta, Nb, Zr).
Terms such as granite pegmatite, mafic pegmatite, syenite pegmatite, or names with any other plutonic rock type as prefix are used.

2. Tabular Pegmatite dyke

3. irregular pegmatite within a fine-grained granite

4. Common economic minerals in pegmatite
Formula
Name
(lithium mica)
lepidolite
KAISi3O8
potassium feldspar
Li2AlSi8O20
petalite
KAl2(AlSi3O10)(OH)2
muscovite mica
FeTa206
tantalite
SiO2
quartz
FeNb2O6
columbite
Be3Al2(SiO3)6
beryl
FeWO4
wolframite
2Cs2O.2Al2O3.9SiO2.H2O
pollucite
CaWO4
scheelite
3BeO.2SiO2.H2O
bertrandite
MoS2
molybdenite
Al2O3
corundum
U3O8
uraninite
(various)
gemstones
(lithium pyroxene)
spodumene

5. Pegmatite
Minerals

6. Break