a) Actinolite specimen with well defined prismatic crystals. The green colour is due to the iron content. This is an example of the asbesti form of the mineral. Probably traded from Quebec. b) Tremolite specimen with well defined prismatic crystals. The white colour is due to the lack of iron and p…
a) Actinolite specimen with well defined prismatic crystals. The green colour is due to the iron content. This is an example of the asbesti form of the mineral. Probably traded from Quebec. b) Tremolite specimen with well defined prismatic crystals. The white colour is due to the lack of iron and presence of magnesium.
Fossilized ammonite (Maclurites) on silty limestone. Calcite crystals growing on the shell, cavity has not been completely filled in. From the Ordovician period.
Fossilized ammonite (Maclurites) on silty limestone. Calcite crystals growing on the shell, cavity has not been completely filled in. From the Ordovician period.
Specimen of azurite (blue) and malachite (green). Well developed tabular azurite crystals on malachite. The malachite is botryoidal. The underside of the specimen is polished.
Specimen of azurite (blue) and malachite (green). Well developed tabular azurite crystals on malachite. The malachite is botryoidal. The underside of the specimen is polished.
Tabular barite crystals (barium sulfate) with an iron oxide coating. Quartz vein running along the underside. The most common use of barite is for drilling mud, also for pharmaceutical purposes.
Tabular barite crystals (barium sulfate) with an iron oxide coating. Quartz vein running along the underside. The most common use of barite is for drilling mud, also for pharmaceutical purposes.
Piece of beryl crystal, greenish in colour. This is a low grade aquamarine. If beryl is dark green, it is emerald. Paper label on side is torn, remaining words read: “K Claim, P ...ng River Tin Mines, Du Bois, Man.” This specimen would be from a pegmatite (slow cooling igneous intrusion).
Piece of beryl crystal, greenish in colour. This is a low grade aquamarine. If beryl is dark green, it is emerald. Paper label on side is torn, remaining words read: “K Claim, P ...ng River Tin Mines, Du Bois, Man.” This specimen would be from a pegmatite (slow cooling igneous intrusion).