What is Aruba made of?
Three main rock groups make up Aruba.
One, igneous rocks were formed from volcanic activity that
occurred about 90 to 95 million years ago. Igneous rocks on Aruba
include diabase, tuffs [from Italian 'tufo'], and schists.
Two, metamorphic rocks were formed from previous existing rocks
that were transformed by high temperatures and pressure.
Metamorphic rocks on Aruba include quartz diorite, gabbro, and a
distinctive variety of quartz diorite called 'hooibergite.'
Three, sedimentary rocks were formed on top of the older igenous
and metamorphic rocks. Sedimentary rocks are the youngest rocks on
Aruba. Limestone is the sedimentary rock on Aruba.
To view hooibergite laced with quartz, please visit the link
provided below.