* Astronomy

Find Location: Palmer, Alaska
Find Date: February 25, 2009
Dry Weight: 56 kg
Maximum Dimensions: 59 cm x 35 cm x 25 cm

Possibly a  fine grained gabbro.  This rock is more fine grained than local basalt, and lacks significant heavy metal concentrations typical for gabbros.  There is in part some similarity in gross appearance to macaulayite, a rare iron aluminium silicate hydroxide.

Source (PDF)