Chris Johnston Photography

23/05/2026

A gradual shift to Substack,

I’m a geologist. I see stories in rocks that most miss. Over the last 300 million years, this granite outcrop has risen from 40 km down to the surface. Exposed over millions more years to freeze-thaw cycles and heat-driven expansion and contraction, its surface has exfoliated — or spalled — in...

03/05/2026

And so I begin again. I have reverted to Nikon from Pentax MF. Slowly the muscle memory is awakening, to be honest a bit like a drunken stagger. 2 new to me bodies a D5 and a D850 and some wicked good glass. These cameras are Samsung 24 Ultras to my Pentax's Nokia 3310. Ill get there. For your amusement, a red gate abstract in the low afternoon sunlight, if you zoom you will see the gate seam is in focus. (D-850 85mm f1.4) and a backlit Cana (D5 600mm f4).

25/09/2024

GB-102 For Sale: Boltwoodite (K,Na)(UO2)[HSio4]-0.5H2O, from Goanikontes, Erongo region, Namibia. Specimen is 35mm x 17mm, boltwoodite is 1cm across. Ex H. Naegele collection, pictures in Namibia 1, L. von Bezing page 495. PM

25/09/2024

KM-321 For Sale: Hotazel Mine rhodochrosite, an early piece, best guess 1970’s. N’Chwaning II rhodochrosite. 70mm x 35mm. Ex Colin Owen. PM

25/09/2024

GT-103 For Sale: A true Gobobosebberge, Erongo Region Namibia rarity, thomsonite, a member of the zeolite group (NaCa2Al5Si5O20-6H20) This is my fourth example in 30 years. In my view this one is the most “gemmy” having a near colorless layer over a straw yellow core. From the Messum side of Gobobosebberge. The specimen is 45mm tall x 40mm wide, the thomsonite is 12mm in diameter. PM

# apophylliteandprehnite # apophyllite

23/09/2024

21/09/2024

geewiz Spudberg, seems a bit skewed....

17/09/2024

For Sale: Magnesite, Farm Kransnek 269 (NW of Dordabis, von Bezing, Namibia 1, P 642, Namibia 2 P 359, Single is 70mm x 40mm the plate is 100mm x 90mm, ex Nagele Collection. These are reputed to be the two best ever found in Namibia.

12/09/2024

One that got away.

11/09/2024

BA-131 For Sale: Berg Aukas Mine (Namibia) descloizite, a lead zinc hydrous vanadium oxide. This is an exceptional example of a common Namibian mineral. It is a large cabinet piece, 220mm wide and 130mm tall and essentially pristine. I cannot recall seeing or having one this large and this good. There won't be another. PM for pricing.