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Improving Mindat.orgPotD is not scoria

15th Sep 2019 01:26 BSTTony Peterson Expert

The specimen depicted may be a welded lithic tuff - it appears to have several types of fragment within it - but is not a piece of scoria, which is a frothy bit of aphanitic basalt either as a flowtop feature, or a bomb.

15th Sep 2019 03:01 BSTGreg Dainty

I agree with Tony.

15th Sep 2019 12:55 BSTRalph Bottrill Manager

Agreed, message sent and changed to Tuff , not sure about being welded, as it’s quite porous, but probably vitric and andesitic.

15th Sep 2019 13:31 BSTRalph Bottrill Manager

There is a bug in that the title of a POTD remains unchanged after editing, on the Front Page.

15th Sep 2019 13:47 BSTChester S. Lemanski, Jr. Manager

It's changed now.

15th Sep 2019 15:55 BSTDavid Von Bargen Manager

Front page is updated every 2 hours. Managers can clear the cache for the front page.
 
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