Pallet, Purple Tarp, Base
A sandstone block with 200 hit points.
Harvest drops
Small Stone× 10-30 @ 20%
Crushed Sand× 10-30 @ 20%
Clay Soil× 10-30
Cobblestone Rocks× 10-30 @ 20%
Wood× 3
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Destroyed Stone (50% of the time) where it lands.
Where to find (22 POIs)
The Last Sunset Nursing Home (tier 5), Housing Development (tier 4), HSP Logistics (tier 4), Infested Warehouse (tier 4), ParKing Garage #2 (tier 4), Pineballs Bowling (tier 4), 4 Ever Video (tier 3), Shamway Warehouse (tier 3), The Road Gentleman Truck Stop (tier 3), Three Dollar Store (tier 3), Working Stiff Tools Warehouse (tier 3), Blue Trailer Trucking (tier 2), Fun-Gi Daycare (tier 2), Mo Power Electronics (tier 2), Ranger Station Echo (tier 2), The "Broken Dreams" house (tier 2), Moe's Grocery (tier 1), Abandoned Depot, Derelict Warehouse, Fallen Survivor Compound, The Seller's Trailer, Wasted Mo Power.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.