Selling on eBay since 2012 with 100% positive feedback. Same excellent specimens and service here with a better shopping experience.

scoria - teaching hand specimen of red scoriaceous basalt from Mauna Loa volcano

$ 7.50

This eye-popping red scoriaceous basalt was collected from a quarry at about 10,500 feet on the north slope of Mauna Loa, Hawaii. Blocks and scoria associated with a satellite cinder cone were used as the road base for the road that leads to the NOAA weather observatory at an elevation of 11,140 feet.

Scoria is the silica poor equivalent of pumice. Lava with a low silica content is runny, so gas bubbles tend to coalesce to form larger bubbles in basalt. In a silica rich granitic magma, high viscosity prevents bubbles from coalescing, so there are many more, but smaller, thin-walled gas bubbles in pumice, one reason it floats longer in water.

These scoria specimens are surprisingly light and are amazingly red from the oxidation of hematite. 

These specimens ship first class unless combined with other purchases.

Select a specimen: You can select a specimen by telling us what is in the photo with it, a blue or black and silver pen, a black mechanical pencil or one of those plus some number of coins, or you can let us make the selection.

Making multiple purchases? Click on the "combine shipping" button in the shopping cart. We'll send an invoice with combined shipping. A link in that invoice will bring you back to checkout, no hassle.