alloy
assay
basic material
blocks
chemical element
chemistry
chunks
element
elemental
freiberg
germany
glossy
group
heap
high purity
highly pure
industrial
isolated
lumps
metallic
mineral resources
mining
periodic system
periodic table
pile
polycrystalline
polysilicon
production
pure
purity
raw material
resource
semiconductor industry
shine
shiny
si
silicon
solar industry
solid
stack
very pure
white background