amnhnyc: ALT It’s time for Trilobite Tuesday! Found within the famed Silurian-age Waldron Shale quarries that dot the Indiana landscape, only one complete, 2.4-in- (6-cm-) long example of the lichid Metopolichas has ever been reported. Still, fragmented remains are relatively common finds throughout the vicinity. Their stunning preservation makes all Waldron trilobites highly prized Paleozoic remnants ..read more

Ruang volcano in Indonesia’s North Sulawesi Province ..read more

New volcanic eruptions north of Grindavîk, Iceland. Photo taken hours ago from a helicopter of the Icelandic Coast Guard ..read more

Cherry red rhodonite (CaMn3Mn[Si5O15]) on galena (PbS). From Broken Hill Mine, New South Wales, Australia. Size: 3 cm x 3 cm x 2.5 cm. Rare classic mineral from Broken Hill ..read more

Red crystals of crocoite (PbCr6+O4) and yellow gibbsite (Al(OH)3) on matrix. From Adelaide Mine, Dundas mineral field, Tasmania, Australia. Size: 4 cm x 3.5 cm x 3 cm ..read more

Brass colored pyrite (FeS2) cube consisting of multiple interpenetrating cubes. From Ambas Aguas, Muro de Aguas, La Rioja, Spain. Size: 1.5 cm x 1.5 cm x 1.5 cm ..read more

Pink rhodochrosite (MnCO3) surrounded by milky quartz (SiO2). From American Tunnel Mine aka Sunnyside, Howardsville, Silverton, Colorado. Size: 2.5 cm x 1 cm x 1 cm ..read more

amnhnyc: ? The large stibnite crystals are made up of tiny building blocks called unit cells, in which atoms and sulfur combine in a regular arrangement. Unit cells repeat in a 3D pattern to form a crystal. ? Happy New Year to all—we hope to see you at the Museum in 2024 ..read more

amnhnyc: ALT This Fossil Friday, meet an exceptionally preserved feathered dinosaur. Sinornithosaurus millennii lived some 130 million years ago and was about 3 ft (1 m) long. When it was discovered, it joined a growing list of dinosaur fossils showing evidence of feathers. But this specimen is especially unique because the imprints of its feathers are astonishingly clear. Scientists think Sinornithosaurus had three types of feathers: simple hairlike filaments, downy tufts (like those on modern birds), and modern feathers along the edges of its limbs!  Photo: M. Ellison/ © AMNH ..read more

amazinglybeautifulphotography ..read more