David K. Joyce

Grenville Minerals, Various Localities, Page Two

Here are some more unusual specimens from the Grenville Geological Province.

All prices in Canadian dollars. For payment in US$, deduct 20% or multiply by 0.8.

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

CorundumGrenville Minerals, Various Localities, Page Two
  • Item #17629
  • Corundum
  • 15.0x11.3x5.7 cm
  • Largest Crystal Size: 45mm
  • $65.00
  • Gutz Farm
  • Rosenthal
    Ontario, Canada
  • A fairly sharp, hexagonal, slightly tapered corundum crystal protrudes out of nepheline syenite along with a number of corundum crystal fragments. Excellent geological and mineralogical sample!
Uraninite, TitaniteGrenville Minerals, Various Localities, Page Two
  • Item #29942
  • Uraninite, Titanite
  • 3.6x3.0x2.8 cm
  • Largest Crystal Size: 5mm
  • $65.00
  • Cardiff Uranium Mine
  • Wilberforce
    Ontario, Canada
  • There is a sharp cube of uraninite on the top of this matrix of fluorite, pyroxene and white calcite. The uraninite crystal is attached to a poorly formed, wedge-shaped titanite crystal. Interesting calcite vein-dyke specimen1
UraniniteGrenville Minerals, Various Localities, Page Two
  • Item #29941
  • Uraninite
  • 3.8x2.7x2.5 cm
  • Largest Crystal Size: 7mm
  • $75.00
  • Cardiff Uranium Mine
  • Wilberforce
    Ontario, Canada
  • A fairly well formed 7mm cube of uraninite sits atop this vein-dyke matrix of fluorite, pyroxene, mica and white calcite.
Titanite, MicroclineGrenville Minerals, Various Localities, Page Two
  • Item #28672
  • Titanite, Microcline
  • 5.2x2.1x2.4 cm
  • Largest Crystal Size: 14mm
  • $40.00
  • Titanite Hill
  • Tory Hill
    Canada
  • A sharp, dark-brown, wedge-shaped titanite crystal is perfectly situated on an elongated microcline crystal.
UraniniteGrenville Minerals, Various Localities, Page Two
  • Item #29945
  • Uraninite
  • 1.0cm cm
  • Largest Crystal Size: 10mm
  • $75.00
  • Cardiff Uranium Mine
  • Wilberforce
    Ontario, Canada
  • A simple, pretty-well complete, simple cube of uraninite from this famous place!
ZirconGrenville Minerals, Various Localities, Page Two
  • Item #29263
  • Zircon
  • 9.0x6.0x5.2 cm
  • Largest Crystal Size: 6mm
  • $45.00
  • Keuhl Lake
  • Brudenell Township
    Ontario, Canada
  • A 6mm, sharp zircon crystal is well exposed in this cavity in feldspar. Keuhl Lake is one of the more famous localities for zircon crystals, in the world.
NephelineGrenville Minerals, Various Localities, Page Two
  • Item #22105
  • Nepheline
  • 13.5x10.0x7.3 cm
  • Largest Crystal Size: 45mm
  • $80.00
  • Davis Hill
  • Bancroft
    Ontario, Canada
  • This fragment of massive nepheline syenite has one side covered with crystals of nepheline. The crystals are hexagonal prisms with pinacoidal terminations. This is the classic nepheline occurrence in the Grenville Geological Province.
Dravite, TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #22281
  • Dravite, Tremolite
  • 5.5x5.5x2.4 cm
  • Largest Crystal Size: Dr 40mm, Tr 8mm
  • $45.00
  • Bancroft
    Ontario, Canada
  • I obtained this specimen years ago from an old collection. It shows a large crystal of tremolite associated with pitch-black crystals of dravite. It is not from Tait Farm but one of the smaller, obscure locations just south of Bancroft. Old label accompanies it.
DraviteGrenville Minerals, Various Localities, Page Two
  • Item #24539
  • Dravite
  • 6.4x3.6x3.2 cm
  • Largest Crystal Size: 13mm
  • $55.00
  • Goshen

  • Ontario, Canada
  • A number of dark-brown dravite crystals are exposed in pure-white calcite cleavages on a phlogopite mica matrix. Nice specimen from an unusual Grenville location! s
Andradite, GrossularGrenville Minerals, Various Localities, Page Two
  • Item #24669
  • Andradite, Grossular
  • 13.0x5.9x5.5 cm
  • Largest Crystal Size: 9mm
  • $45.00
  • Marmoraton Mine
  • Marmora
    Ontario, Canada
  • Nice example of the garnets from the gigantic skarn zone that is/was the Marmoraton Iron Mine. The mine was a very large open pit that has now been closed for decades. Some feldspar crystals associated. Nice! s
Muscovite, TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #24735
  • Muscovite, Tremolite
  • 6.9x3.8x4.7 cm
  • Largest Crystal Size: 36mm
  • $40.00
  • Calumet Island
  • Pontiac County
    Quebec, Canada
  • Interesting, twinned muscovite crystals nicely exposed in white marble matrix. The crystals resemble a Mercedes-Benz symbol. Unusual crystallization.
Muscovite, TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #24739
  • Muscovite, Tremolite
  • 14.1x6.5x5.1 cm
  • Largest Crystal Size: Mu 40mm
  • $65.00
  • Calumet Island
  • Pontiac County
    Quebec, Canada
  • This specimen shows a number of "hockey stick"-like twinned crystals of muscovite embedded in but nicely exposed in/on white calcite-tremolite marble. twinning like this is not often seen in muscovite.
SchorlGrenville Minerals, Various Localities, Page Two
  • Item #24741
  • Schorl
  • 11.1x5.2x5.5 cm
  • Largest Crystal Size: 30mm
  • $65.00
  • Calumet Island
  • Pontiac County
    Ontario, Canada
  • Terminated crystals of schorl are nicely exposed on white marble in this specimen. One particular crystal is dominant. Interesting piece from an unusual locality!
StilbiteGrenville Minerals, Various Localities, Page Two
  • Item #24747
  • Stilbite
  • 6.9x 5.2x3.8 cm
  • Largest Crystal Size: 2mm
  • $55.00
  • Strain Lake, HWY 41, nr. Khartoum, Griffith TWP.
  • Renfrew County
    Ontario, Canada
  • A vug of stilbite crystals from the Grenville! These crystals were precipitated from low temperature hydrothermal solutions that broke down older silicates in the surrounding rocks. Unusual!
TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #24786
  • Tremolite
  • 8.8x5.9x4.0 cm
  • Largest Crystal Size: n/a
  • $40.00
  • H&H Quarry, Haley Sta., Ross TWP
  • Renfrew County
    Ontario, Canada
  • Very colourless, tightly packed tremolite crystals. Tremolite usually has a green tint due to iron content. If iron content is high enough, the tremolite transitions to the actiolite end of the tremolite-actinolite series. This is pure end-member tremolite!
RutileGrenville Minerals, Various Localities, Page Two
  • Item #24897
  • Rutile
  • 3.5x2.4x1.7 cm
  • Largest Crystal Size: 18mm
  • $45.00
  • MacGregor Lake
  • Templeton Township
    Quebec, Canada
  • This is the premier rutile locality in the Grenville and has produced many striated, twinned and untwinned rutile crystals. Here is a nice example!
DraviteGrenville Minerals, Various Localities, Page Two
  • Item #24915
  • Dravite
  • 5.1x4.4x3.5 cm
  • Largest Crystal Size: 16mm
  • $40.00
  • West Pierrepont
  • St. Lawrence Co.
    New York, USA
  • A couple of black dravite crystals are partially embedded in a matrix of light-coloured tremolite crystals. The dravite crystals have the crayon-shape termination and good lustre. Unusual specimen from the American side of the Grenville Geological province. s
Pyroxene, etc.Grenville Minerals, Various Localities, Page Two
  • Item #26302
  • Pyroxene, etc.
  • 6.8x4.4x3.7 cm
  • Largest Crystal Size: 10mm
  • $35.00
  • Yates Mine
  • Otter Lake
    Quebec, Canada
  • A plate of lustrous, very dark green pyroxene crystals, associated with pinkish, rounded microcline crystals and dark purple fluorite around some of the crystals.
Rutile, AegirineGrenville Minerals, Various Localities, Page Two
  • Item #26313
  • Rutile, Aegirine
  • 5.7x3.0x2.5 cm
  • Largest Crystal Size: 16mm
  • $45.00
  • Little Dam Lake
  • Wakefield
    Quebec, Canada
  • This isuch an interesting locality for rutile! You can see the rutile in the calcite matrix as very elongated, almost ropy crystals, that curve and snake between the green, aegirine crystals. Very cool!
TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #26314
  • Tremolite
  • 6.7x6.8x6.2 cm
  • Largest Crystal Size: 17mm
  • $55.00
  • Minden

  • Ontario, Canada
  • The display front of this specimen shows nicely exposed equant crystals of very light-green tremolite crystals, naturally etched from calcite matrix. Most of the crystals are doubly terminated with nice terminations.
FluoriteGrenville Minerals, Various Localities, Page Two
  • Item #26419
  • Fluorite
  • 5.5x3.5x3.9 cm
  • Largest Crystal Size: as above
  • $55.00
  • Rogers Mine
  • Madoc
    Ontario, Canada
  • A very gemmy, light green, cube of fluorite with octahedral modifications. Old timer!
Diopside, CalciteGrenville Minerals, Various Localities, Page Two
  • Item #26478
  • Diopside, Calcite
  • 7.8x6.5x6.5 cm
  • Largest Crystal Size: 54mm
  • $75.00
  • Dog Lake
  • Battersea
    Ontario, Canada
  • A rather large, for the locality, diopside crystal is nicely exposed in creamy-white calcite, along with some much smaller crystals. The diopside crystals are a very pale greenish colour and associated with a few phlogopite crystals. Displays well.
TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #26581
  • Tremolite
  • 2.8x2.7x2.6 cm
  • Largest Crystal Size: as above
  • $45.00
  • Norland

  • Ontario, Canada
  • A doubly terminated dark green, short prismatic tremolite crystal from Norland. Usually, crystals from this location are smaller! Nice one1
Dravite, QuartzGrenville Minerals, Various Localities, Page Two
  • Item #26595
  • Dravite, Quartz
  • 10.3x5.0x5.3 cm
  • Largest Crystal Size: 33mm
  • $140.00
  • Powers Farm
  • Pierrepont
    New York, USA
  • A cluster of black, lustrous, equant dravite crystals, associated with rough quartz crystals. The cluster shows three main dravite crystals and some smaller ones. Displays nicely too! A Very nice specimen from the American side of the Grenville Geological Province.
TremoliteGrenville Minerals, Various Localities, Page Two
  • Item #29528
  • Tremolite
  • 14.0x2.9x2.5 cm
  • Largest Crystal Size: As above
  • $45.00
  • Bristol (Hilton Mine)
  • Bristol twp. Pontiac Co.
    Quebec, Canada
  • A long fragment of tightly packed tremolite crystals, with a curious curvature to it. Very light coloured so I assume it is close to end-member tremolite. From an unusual locality, as well!
MagnetiteGrenville Minerals, Various Localities, Page Two
  • Item #27973
  • Magnetite
  • 7.8x7.0x3.7 cm
  • Largest Crystal Size: 20mm
  • $45.00
  • Bentley Lake Occurence
  • Bancroft, Hastings County
    Ontario, Canada
  • A couple of fairly well formed, simple octahedra of magnetite are nicely exposed in the middle of this calcite vein-dyke matrix. Shows well.
Grossular, Diopside, CalciteGrenville Minerals, Various Localities, Page Two
  • Item #29674
  • Grossular, Diopside, Calcite
  • 6.4x3.3x3.5 cm
  • Largest Crystal Size: 6mm
  • $45.00
  • York River Skarn Zone
  • Bancroft, Hastings County
    Ontario, Canada
  • The York River area has been off limits for many years now, since the installation of a conservation area. This specimen was collected decades ago and sports a very well formed grossular crystal. Could be etched to reveal more grossulars and diopside crystals...or not. :)
DiopsideGrenville Minerals, Various Localities, Page Two
  • Item #29491
  • Diopside
  • 2.0x1.2x0.9 cm
  • Largest Crystal Size: As above
  • $35.00
  • Ch. Principal road cut
  • N. of Laurel
    Quebec, Canada
  • A well-formed, partially gemmy, singly terminated crystal of diopside from this Grenville occurrence.