Siliceous Sinter, Quartz and Chalcedony
Apr 26, 2015 19:16:24 GMT -5
garock, gingerkid, and 3 more like this
Post by 150FromFundy on Apr 26, 2015 19:16:24 GMT -5
Siliceous Sinter is also knows as Geyser Quartz or Geyser Opal. The crystals generally take the form of a typical quartz crystal but they are formed in layers in geyser like (splash) conditions. The outer layers are microcrystalime and the specific gravity is less than typical quartz.
These pieces were collected last weekend at McKay Head, near Parrsboro, Nova Scotia.
Siliceous Sinter.
Siliceous Sinter. This one looks like an old fossilized jaw bone with a few teeth sticking out.
Siliceous Sinter.
Siliceous Sinter Geode.
The next geode two halves had a few visible crystals on the outside, but the matrix had not provided enough space for the crystals to grow. It was almost a piece of Leaverite. It then almost ended up in the backyard rock garden. Fortunately, I decided to give it a whack. It split clean with one hammer blow on the chisel to reveal some nice unblemished quartz crystals.
Quartz Geode. These two unexpectedly turned out to be my find of the day.
Quartz Geode.
The last one is a piece of geode that formed with a blue chalcedony rind filled with a siliceous sinter inside. It’s a little bruised but still makes an interesting specimen.
Darryl.
These pieces were collected last weekend at McKay Head, near Parrsboro, Nova Scotia.
Siliceous Sinter.
Siliceous Sinter. This one looks like an old fossilized jaw bone with a few teeth sticking out.
Siliceous Sinter.
Siliceous Sinter Geode.
The next geode two halves had a few visible crystals on the outside, but the matrix had not provided enough space for the crystals to grow. It was almost a piece of Leaverite. It then almost ended up in the backyard rock garden. Fortunately, I decided to give it a whack. It split clean with one hammer blow on the chisel to reveal some nice unblemished quartz crystals.
Quartz Geode. These two unexpectedly turned out to be my find of the day.
Quartz Geode.
The last one is a piece of geode that formed with a blue chalcedony rind filled with a siliceous sinter inside. It’s a little bruised but still makes an interesting specimen.
Darryl.
