Sand Spikes are known to be a bit of a mystery in the mineral realm. They are composed of solid sandstone but there can be no fossil material found inside! The mineral that glues the grains together is calcite!
 
I love the simple mystery behind sand spike concretions.. No one has proven exactly how sand spikes are formed & that just makes me think about what the earth could have been doing to make these strange rocks!
 
Weight: 332 grams
Size: 4.5"x3"x2"