David K. Joyce

Grenville, Spinel, Hogbomite, Dewitt's Corners, Lanark Co., Ontario

Here is an interesting spinel locality! These specimens feature spinel crystals in calcite. The spinel crystals, a very dark green, literally black colour, are usually composed of many smaller, stacked octahedra of spinel. Interestingly, many of them are partially or totally altered to or overgrown by corundum. As well, ALL of the specimens show micro crystals of hogbomite, usually in oriented crystals on the spinel crystals. Very interesting assemblage!

All prices in Canadian dollars. For payment in US$, deduct 18% or multiply by 0.82.

Click on any of the following thumbnails to view a larger image of the specimen.

Spinel, Hogbomite, CorundumGrenville, Spinel, Hogbomite, Dewitt's Corners, Lanark Co., Ontario
  • Item #12120
  • Spinel, Hogbomite, Corundum
  • 4.2x3.2x2.3 cm
  • Largest Crystal Size: 12mm
  • $40.00
  • Dewitt's Corners
  • Lanark County
    Ontario, Canada
  • A couple of well formed spinel crystals that are partially altered to corundum are nicely exposed in their calcite matrix. Also a nice hogbomite crystal.
Spinel, CorundumGrenville, Spinel, Hogbomite, Dewitt's Corners, Lanark Co., Ontario
  • Item #26474
  • Spinel, Corundum
  • 3.5x3.2x2.1 cm
  • Largest Crystal Size: as above
  • $45.00
  • Dewitt's Corners
  • Bathurst Township
    Ontario, Canada
  • Here is another interesting alteration combination. This is a warped, mis-shapen spinel crystal with each face composed of a mosaic of small, sharp, triangular spinel crystal faces. Much of the white that you can see it corundum and the spinel crystal has been partially altered to corundum in many places. Also some calcite and chlorite attached. Interesting piece!