The+Geology+Files+2

//__Mark's report:__//
The ball has a density of 8.176g/cm³. It is probably a manganese steel ball as used in a ball-mill. Lots of balls, larger than this, are put into a big drum along with rocks. As the drum rotates, the balls drop onto the rocks and crush the rocks into a powder, for example, cement. The balls wear out too, and the small ones, like this sample, are tossed out. The pitting on the surface is part of the wear and tear from the balls banging against each other in the ball-mill.

=Mika's Family of Rocks: A Very Different Point of View= BIG and friendly. VERY noisy! || **Name: SLIDE** Smooth and quiet. Always whispers. Loves the sun. || sandstone greywacke || Fine micaceous sandstone greywacke || Talks a lot. Bossy and messy. || **Name: ROCKY** Solid as a mountain. Very happy. Likes Tuatara and being warm. || quartz vein. || Quartz from a vein in metamorphic rock. Small amounts of feldspar, possibly. || Very neat. Likes tidy bedrooms. A lizard-lover. || **Name: MICA** Bumpy and sparkly. Daydreams a lot. || Two veins of quartz. || Micaceous schist. Weak foliation. Lots of quartz, mica and chlorite. || Shy. Loves water and rivers. Scared of the dark. || **Name: HICKY** Very friendly. Hiccups lots. Favourite food? Other rocks! || Heavy minerals and a quartzy matrix. || Mostly vein quartz from a metamorphic rock. || So flat and smooth. Quiet and playful. || **Name: MIKA** Bubbly, curious. Wants to save Pandas. || Female, juvenile. ||
 * **Name: BABY**
 * [[image:P1060908-1.JPG width="156" height="207"]] || [[image:P1060912.JPG width="150" height="208"]] ||
 * Well-rounded boulder
 * **Name: PIGSNOUT**
 * [[image:P1060917.JPG width="163" height="234"]] || [[image:P1060916.JPG width="163" height="232"]] ||
 * Siltstone with cross-cutting
 * **Name: LINEY**
 * [[image:P1060909.JPG width="171" height="216"]] || [[image:P1060910-1.JPG width="158" height="223"]] ||
 * Sandstone greywacke.
 * **NAME: FISH LIPS**
 * [[image:P1060911.JPG width="159" height="215"]] || [[image:P1060910.JPG width="161" height="222"]] ||
 * Siltstone/claystone greywacke.
 * **Name: FLATTY**
 * [[image:P1060924-2.JPG width="170" height="243"]] || [[image:P1060903.JPG width="162" height="251"]] ||
 * Fine sandstone greywacke. || Homo sapiens.

Geology Files 1