Goethite after Marcasite

specimen number:
2063731

location:
White Desert, Farafra Oasis, New Valley Governorate, Egypt

description:
A cluster consisting of one large very sharp crystal of what was once marcasite, this with numerous smaller crystals attached on both sides, in a floater cluster and replaced by somewhat lustrous brown goethite. The replacement most likely contain some hematite as well. This is in super condition all around, the quality is excellent. The specimen comes with a previous label from the collection of Ray DeMark.

Located in the Farafra Depression of western Egypt, the White Desert is celebrated for its dramatic Cretaceous chalk formations, wind-sculpted rock towers, and unique mineralogical oddities. Historically traversed by ancient trade caravans, the region became a major destination for collectors due to the surface weathering of iron-rich nodules weathered out of the soft Khoman Chalk formation. Over millions of years, primary iron sulfide minerals like marcasite oxidized under arid desert conditions, creating pristine goethite and hematite pseudomorphs that retain the intricate radiating, spiked, or globular crystal habits of the original mineral while converting entirely to dark iron oxide. Popularly referred to as prophet stones, Egyptian stars, or desert flowers, these highly lustrous, jet-black to dark-brown specimens are eagerly sought by mineral collectors worldwide for their crisp sharp edges, distinctive shapes, and remarkable state of preservation.

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