Obsidian

Igneous
A natural volcanic glass formed in
quick-cooling lava. Sharp edged
but smooth on surface.
Colours: black, purple blue
Elements: Silicon (Si) oxygen (O)
Rarity: Uncommon
6.5
Moh scale rating
Granite

Igneous
A rough, sandy rock created
by slowly cooling lava.
Speckled texture
Colours: Range from white to
grey
Rarity: Common
7.0
Sandstone

Sedimentary
6.5/7
Made of small sand pieces
including Quartz, feldspar
and other mineral fragments.
Found mainly underwater but
also in deserts.
Colours: red, orange , brown
white
Rarity: Common
Elements: Si O K Na
Coal

Sedimentary
3.5
Formed by the
fossilized remains of a
plant. Found in bogs
and swamps. Useful for
steam power and
heating. Charcoal is a
quicker version made
by burning wood and
timber.
Colours: Black
Elements: C H O (S N)
Quartzite

Metamorphic
7.0
Made mainly of Quartz, a
metamorphosed version of
Quartz sandstone. Often
white like the sand which
it was made from.
Has a medium grainy
texture.
Colours: White, brown or
green.
Rarity: Rare.
Diamond
Gemstone
Hardest thing known to man.
Usually found clear but can be most
colours of the rainbow. Made from
carbon. Used in jewellery and saws.
The colours in the diamond depend
on the impurities of it. For example
boron makes it a blue and nitrogen
makes it yellow.
Colours: Mainly white can be any
other colour.
10 Elements: C(can contain small
amounts of B & N).
Rarity: Extra-extremely
extraordinarily rare!!!!!
