David K. Joyce Minerals

Grenville Minerals, Various Localities

The Central Metasedimetary Belt of the Grenville Geological Province is famous for large, well formed crystals of apatite, amphiboles, titanite, zircon, etc. I live very close to one of the more productive areas of the Grenville and am happt you present to you these very nice specimens of those sorts of minerals. Here are some:

All prices in Canadian dollars. For payment in US$, deduct 22% or multiply by 0.78.

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

ForsteriteGrenville Minerals, Various Localities
  • Item #17740
  • Forsterite
  • 4.1x3.0x2.9 cm
  • Largest Crystal Size: 25mm
  • $65.00
  • Parker Mine
  • Notre Dame du Laus
    Quebec, Canada
  • An absolutely excellent well-formed crystal of forsterite sits atop a matrix of calcite and forsterite crystal sections. An excellent specimen of this variety of olivine. Displays perfectly.
Pyroxene GroupGrenville Minerals, Various Localities
  • Item #18255
  • Pyroxene Group
  • 4.7x2.0x1.8 cm
  • Largest Crystal Size: 47mm
  • $35.00
  • Trapper's Trail
  • Haliburton Co.
    Ontario, Canada
  • A nice, singly terminated crystal with a small attached crystal on one side. Nice!
TremoliteGrenville Minerals, Various Localities
  • Item #17747
  • Tremolite
  • 10.5x9.7x4.7 cm
  • Largest Crystal Size: 50mm
  • $110.00
  • Harcourt Park Road
  • Wilberforce
    Ontario, Canada
  • A rather large terminated tremolite crystal sits atop massive tremolite and other smaller tremolite crystals. The crystals have a nice green colour and are striated. Stands perfectly for display, as shown.
TourmalineGrenville Minerals, Various Localities
  • Item #9959
  • Tourmaline
  • 6.4x5.8x5.7 cm
  • Largest Crystal Size: 8mm
  • $40.00
  • Tulip Valley

  • Quebec, Canada
  • Lots of brilliantly lustrous, black tourmaline crystals are scattered around amongst light green, rounded pyroxene crystals. Striking, really. Unusual locality.
TremoliteGrenville Minerals, Various Localities
  • Item #18267
  • Tremolite
  • 5.6x4.6x3.2 cm
  • Largest Crystal Size: 31mm
  • $35.00
  • Burleigh Road
  • Wilberforce
    Ontario, Canada
  • A specimen showing a large terminated, deep green, tremolite crystal, along with some smaller ones. A little calcite.
Rutile, FeldsparGrenville Minerals, Various Localities
  • Item #10656
  • Rutile, Feldspar
  • 6.6x6.8x4.5 cm
  • Largest Crystal Size: 18mm
  • $45.00
  • McGregor Lake

  • Quebec, Canada
  • A heavily striated complete rutile crystal is nicely situated on this feldspar matrix with a couple of pinkish feldspar crystals. The rutile does not look complete but it is! Nice piece!
Spessartine, MuscoviteGrenville Minerals, Various Localities
  • Item #12138
  • Spessartine, Muscovite
  • 5.2x3.0x0.3 cm
  • Largest Crystal Size: s-4.5mm
  • $35.00
  • Villeneuve Mine
  • 31-I Villeneuve Township, Papineau Co.
    Quebec, Canada
  • Interesting specimen showing a spessartine crystal, flattened in and between sheets of biotite.
Spessartine, MuscoviteGrenville Minerals, Various Localities
  • Item #12144
  • Spessartine, Muscovite
  • 8.3x5.1x0.3 cm
  • Largest Crystal Size: s-5mm
  • $75.00
  • Villeneuve Mine
  • 31-I Villeneuve Township, Papineau Co.
    Quebec, Canada
  • Four, sharp, flattened crystals of gemmy red spessartine are embedded in this "book" of mica. If you hold it to the light, you can see that the garnets go right through the mica(Of course you can see them on the other side too!). An attractive, interesting specimen from this large pegmatite deposit.
Spessartine, MuscoviteGrenville Minerals, Various Localities
  • Item #12147
  • Spessartine, Muscovite
  • 11.5x8.2x0.2 cm
  • Largest Crystal Size: 5mm
  • $60.00
  • Villeneuve Mine
  • 31-I Villeneuve Township, Papineau Co.
    Ontario, Canada
  • A single ruby-red spessartine crystal is embedded in this muscovite crystal. The spessartine crystal can be seen on both sides of the mica. Very good specimen from this large pegmatite deposit.
TremoliteGrenville Minerals, Various Localities
  • Item #17739
  • Tremolite
  • 5.2x3.1x3.0 cm
  • Largest Crystal Size: 30mm
  • $35.00
  • Miner's Bay
  • Minden Hills
    Ontario, Canada
  • A well shaped tremolite crystal sits atop some smaller tremolite crystals and massive tremolite. Nice example of this mineral.
TremoliteGrenville Minerals, Various Localities
  • Item #18245
  • Tremolite
  • 4.8x3.6x2.4 cm
  • Largest Crystal Size: as above
  • $65.00
  • Dancey Property
  • Haliburton Co.
    Ontario, Canada
  • A very nice, deeply striated, highly lustrous, end-member tremolite crystal with a smaller crystal attached. These crystals do not have sharp terminations but do have excellent prism faces. Fairly gemmy with a very slight greenish colouration.
Titanite, AnataseGrenville Minerals, Various Localities
  • Item #18243
  • Titanite, Anatase
  • 4.0x3.1x1.7 cm
  • Largest Crystal Size: as above
  • $75.00
  • Cardiff Uranium Mine
  • Wilberforce
    Canada
  • This is an interesting one! This was once a titanite crystal but the outer shell of it has been altered to anatase. You can see from the broken places that the core is dark brown titanite and the outer shell is a lighter-coloured anatase. A little purple fluorite attached. Classic.
TremoliteGrenville Minerals, Various Localities
  • Item #18188
  • Tremolite
  • 4.1x4.3x1.9 cm
  • Largest Crystal Size: n/a
  • $40.00
  • Miner's Bay

  • Ontario, Canada
  • A very sharp, dark green, excellent prism of tremolite with poor terminations.
Calcite, MarcasiteGrenville Minerals, Various Localities
  • Item #17706
  • Calcite, Marcasite
  • 6.0x4.0x3.3 cm
  • Largest Crystal Size: as above
  • $60.00
  • Canada Talc Mine, Dolomite Pit
  • Madoc
    Ontario, Canada
  • A rather large (for the locality), twinned calcite crystal with no matrix. The crystals is lustrous, shows the rhombohedron form, predominately and has tiny specks of marcasite crystals just under the surface of the crystal. Some bruising on the sides. Displays very well.
DiopsideGrenville Minerals, Various Localities
  • Item #15499
  • Diopside
  • 4.2x1.8x1.5 cm
  • Largest Crystal Size: as above
  • $35.00
  • Dog Lake
  • nr. Battersea
    Ontario, Canada
  • A very well formed, twinned crystal of diopside from the locality at Dog Lake. It is a light green colour with a partial talc alteration coating. Again, textbook pyroxene-group twinning!
DiopsideGrenville Minerals, Various Localities
  • Item #15503
  • Diopside
  • 5.8x5.5x2.4 cm
  • Largest Crystal Size: 27mm
  • $40.00
  • Dog Lake
  • nr. Battersea
    Ontario, Canada
  • Several, sharp diopside crystals are perfectly exposed on this calcite matrix. The crystals are all sharp but to some extent hoppered. They are a light green colour with a thin talc alteration veneer. Nice specimen!
PyroxeneGrenville Minerals, Various Localities
  • Item #15655
  • Pyroxene
  • 6.7x3.6x2.9 cm
  • Largest Crystal Size: as above.
  • $45.00
  • Lot 13, Rang 15, Canton de Hull
  • Gatineau
    Quebec, Canada
  • A very light coloured, well formed pyroxene group crystal. The crystal is square in cross section with beveled sides and a very good termination. An old classic.
TitaniteGrenville Minerals, Various Localities
  • Item #16174
  • Titanite
  • 2.6x1.4x1.2 cm
  • Largest Crystal Size: 16mm
  • $65.00
  • Haliburton

  • Ontario, Canada
  • A beautiful twinned titanite crystal attached to white calcite. This is an excellent example of twinning in titanite!
CalciteGrenville Minerals, Various Localities
  • Item #16175
  • Calcite
  • 5.2x3.7x3.4 cm
  • Largest Crystal Size: 27mm
  • $75.00
  • Lyndhurst

  • Ontario, Canada
  • A lovely cluster of calcite crystals from this famous old locality. Back in the 30/40's, a Quartz mine was operated just outside of Lyndhurst, for quartz crystals. The quartz crystals were used for electronic purposes. On occasion, very nice calcite crystals, striped with red hematite and with tiny marcasite inclusions accompanied the quartz in the vugs. Here is a nice example!
Amphibole GroupGrenville Minerals, Various Localities
  • Item #18193
  • Amphibole Group
  • 5.3x3.3x2.2 cm
  • Largest Crystal Size: 27mm
  • $40.00
  • Trapper's Trail
  • Haliburton
    Ontario, Canada
  • A couple of very sharp amphibole crystals propped up by a pyroxene crystal fragment. Very nice!
FluorapatiteGrenville Minerals, Various Localities
  • Item #16952
  • Fluorapatite
  • 6.8x5.0x3.1 cm
  • Largest Crystal Size: 28mm
  • $35.00
  • Canoe Lake
  • Bedford Township
    Ontario, Canada
  • A couple of blue fluorapatite crystals are embedded in this white, granular calcite matrix. Classic Grenville location!
MarialiteGrenville Minerals, Various Localities
  • Item #17016
  • Marialite
  • 8.5x1.9x1.8 cm
  • Largest Crystal Size: as above
  • $40.00
  • North Baptiste Lake Road
  • Bancroft, Hastings County
    Ontario, Canada
  • A very nice scapolite crystal with a long length to width ratio. Elegant crystal with some classic mica alteration, sort of like several scapolite crystals merged together. The termination is multiple and most parts are complete. One part of the termination was in contact with another crystal. Nice!