4095 Wulfenite, Mežica, Slovenia

Brown wulfenite crystals, some with hoppered faces. Ex Diederik Visser 6/2005. Width of view 3.5mm. Stack of 30 images. Click on the image below for a higher resolution version.

20122 Potassium

1 gram of potassium metal 99.8% pure in glass vial under mineral oil. The mineral oil prevents but doesn’t entirely stop the oxidization of the potassium metal, hence the purple hue.