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@doktrock@toad.social
2026-09-26 19:37:21

The intricate crystallography of #quartz is well described at The Quartz Page - there's more to it than one might assume! For example, each silica tetrahedron is a member of 2 threefold and 2 sixfold helices. Plus, rotational axes, etc. ⚒️🧪 #MinCup26

@doktrock@toad.social
2026-09-26 20:20:20

A cluster of #Quartz crystals from the Tucson show ⚒️🧪 #MinCup26

A cluster of light green, elongated, quartz crystals, probably 10 or so cm across, pointing in all different directions. Label says Quartz 1,500 (not sure if that's a price?) Huanggang Mine, Inner Mongolia Autonomous Region, China #02705 K
@doktrock@toad.social
2026-10-01 20:55:21

#Quartz aka rock crystal carved vase, Francesco Tortorino, Milan, 1550-75. Museo Nacional del Prado, Madrid. #MinCup26. My own ⚒️

An elaborate, two handled, clear vase, with a lid. Museum Text: Hunting vase Francesco Tortorino, Milan, 1550-75 Rock crystal Carved with exceptional skill, the decoration of the central section may refer to Charles V or Philip Il's military deeds. The figure holding a rabbit is possibly a reference to classical Hispania.
@doktrock@toad.social
2026-09-30 20:27:40

#Quartz var. Flint - school children promoted the idea Knife River Flint should be the state rock of North Dakota. It was approved! Historically widely used and traded by indigenous peoples #MinCup26

A dark brown vitreous rock, approximately 7 × 8 cm, with light yellow weathering surface. It shows conchoidal fracture. My photo.
@colinpurrington@flipping.rocks
2026-09-21 21:06:55

Geology folks, is this a stain caused by iron-oxides? Shawangunk conglomerate near Mohonk Lake in New Paltz, New York. #NewYork #mohonk #geology #rocks #quartz #chemistry