David K. Joyce Minerals

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 19% or multiply by 0.81.

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

Spinel, CorundumGrenville, Spinel, Hogbomite, Dewitt's Corners, Lanark Co., Ontario
  • Item #5028
  • Spinel, Corundum
  • 4.1x3.4x2.2 cm
  • Largest Crystal Size: 19mm
  • $30.00
  • Dewitt's Corners

  • Ontario, Canada
  • A composite crystal of black spinel is exposed on a chunk of creamy calcite. You can see that the lower reached of the spinel are coated with or altered to corundum. Characteristic of this Grenville spinel occurrence.
Spinel, HogbomiteGrenville, Spinel, Hogbomite, Dewitt's Corners, Lanark Co., Ontario
  • Item #12131
  • Spinel, Hogbomite
  • 2.6x2.1x2.1 cm
  • Largest Crystal Size: 21mm
  • $55.00
  • Dewitt's Corners
  • Lanark County
    Ontario, Canada
  • A cluster of two complete spinel crystals and one incomplete. The crystals are fairly well formed and show the "stacked octahedral" construction. No corundum on this specimens. A couple of nice hogbomite crystals. Very nice thumbnail sized specimen.
Spinel, Hogbomite, CorundumGrenville, Spinel, Hogbomite, Dewitt's Corners, Lanark Co., Ontario
  • Item #12122
  • Spinel, Hogbomite, Corundum
  • 4.8x4.1x3.1 cm
  • Largest Crystal Size: 14mm
  • $45.00
  • Dewitt's Corners
  • Lanark County
    Ontario, Canada
  • A fairly sharp spinel crystal associated with hogbomite and some corundum is embedded in coarse calcite. Nice!
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, Hogbomite, CorundumGrenville, Spinel, Hogbomite, Dewitt's Corners, Lanark Co., Ontario
  • Item #12118
  • Spinel, Hogbomite, Corundum
  • 2.6x2.2x1.3 cm
  • Largest Crystal Size: 14mm
  • $35.00
  • Dewitt's Corners
  • Lanark County
    Ontario, Canada
  • A fairly well formed spinel crystal that is partially altered to and/or overgrown by corundum and has a couple of nice hogbomite crystals on it.
Spinel, Hogbomite, CorundumGrenville, Spinel, Hogbomite, Dewitt's Corners, Lanark Co., Ontario
  • Item #12135
  • Spinel, Hogbomite, Corundum
  • 2.5x2.0x1.8 cm
  • Largest Crystal Size: as above
  • $30.00
  • Dewitt's Corners
  • Lanark County
    Ontario, Canada
  • A single crystal of spinel that has a well formed upper half and a distorted lower half inter-grown with calcite. There are a couple of modest hogbomite crystals on this one.
Spinel, Hogbomite, CorundumGrenville, Spinel, Hogbomite, Dewitt's Corners, Lanark Co., Ontario
  • Item #12116
  • Spinel, Hogbomite, Corundum
  • 5.6x3.9x1.8 cm
  • Largest Crystal Size: 17mm
  • $40.00
  • Dewitt's Corners
  • Lanark County
    Ontario, Canada
  • A partially, well-formed spinel crystal is inter-grown with calcite on this specimen. Also a couple of nice hogbomite crystals and a little corundum alteration.