Rocks
I know what these rocks are generally but I’m guessing at some mineralogic details. I have more images, in the Abstract sense but explained, on my Instagram site, Glaciogenic.
Bordered Breccia in Marble: The architectural name of the rock is Rosso Lavanto, likely from Carrera, Italy. Breccia is broken pieces incorporated into the original sediment that are then lithified. In this case, calcite likely crept around the pieces. The marble images are from a siding I saw in New Orleans in 2017. The image is of an area about 0.5 m wide.
Layered sedimentary rock formation, White Island, New Zealand: The yellowish color is from impregnated sulfur. I traveled to White Island in 2009, several years before it erupted.
Haloed Serpentinite Inclusion in Marble: I’m guessing that the red halo likely resulted from the temperature gradient that developed across the contact between the marble and the inclusion, maybe leaching iron to make it redder. The image is of an area about 0.5 m wide.
Layered Volcanics on White Island, NZ: The sulfur and iron staining provided magnificent colors.
Petrified Wood A: Exposed face of a petrified log, Petrified Trail, southern Utah.
Petrified Wood B: Exposed face of a petrified log, Petrified Trail, southern Utah.
Petrified Wood C: Exposed face of a petrified log, Petrified Trail, southern Utah.
Veined Marble: The image is of an area about 0.5 m wide. There are box-like and web-like intricate veinings. The green material looks fibrous. At the upper left, there appears to be a fold.
Water Staining in Sandstone: Water permeates porous rocks and can leave minerals behind in what appears to be veins. The phenomenon is called Liesegang banding. The image is of an area about 1 m wide. I found this slab in a Massachusetts granite and marble warehouse where you can pick out what you want for a countertop and have it shipped to your dealer. The place was a geologic showcase.
Layered Sandstone Contacts: Unconformable contacts overlain by leached drippings, Zion National Park, Utah.