Cubaris sp. "Gold Flake Sabah" Isopod Wulfenite and you will more often

and you will more often than not see them sold under that name and description

black tourmaline

This is a beautiful example of growth forms typical of this region

Chalcedony is the cryptocrystalline version of quartz with similar requirements for growth

one is shaped like two points of a star with symmetry that doesn't seem accidental (second to last image)

Cubaris sp. "Gold Flake Sabah" Isopod Wulfenite and you will more oftenI have a hard time passing up isopod morphs with mineral names, and Cubaris sp. Gold Flake Sabah does not disappoint. It has a lovely mottled brown and light brown pattern, with some showing a lighter golden brown coloration. This morph is especially well camouflagedyou can be looking right at one and not see it until it moves. They can be a bit shy so you may not spot them much at first, but they reproduce relatively quickly for a Cubaris so one day