tufa - large hand/display specimen from the paleoshoreline of ice age Lake Lahontan Publication was originally in separate

Publication was originally in separate fascicles

As described in 1925 by mining engineer Carl Millikan

We had this sand in storage and thought it was entirely olivine

but they are decent student specimens at a decent price

The ideal formula is Ca2Mg5Si8O22(OH)2

tufa - large hand/display specimen from the paleoshoreline of ice age Lake Lahontan Publication was originally in separateTufa is a calcium carbonate deposit that forms around the outlet of a hot spring that emerges below the surface of a body of water. These examples were formed during the Pleistocene high stand of Lake Lahontan, which filled a connected grouping of basins in Nevada east of Reno. It was similar to ice age Lake Bonneville in Utah, and now is greatly reduced in size. Its peak was approximately 12,700 years ago and its largest remnant is Pyramid Lake,