It cites that these defects were unusual since the bulk of the milky-white stone defect had several small stones that were essentially round. All white stone defects had alumina/silica/zirconia amorphous and rounded beads with fine, tetragonal zirconia crystals.Selkregg...
Make good skipping stones. Chert I think these interesting rocks are chert. Agates Part 1, Lake Superior Beach Rocks & Agates Part 2. More pictures and descriptions of other types of rocks found on Lake Superior beaches plus a few pix of Lake Superior Agates. Pictures of Agates & Almost ...
4392476Method and apparatus for placing identifying indicia on the surface of precious stones including diamonds1983-07-12Gresser et al.125/30.01 4354189Switch and lock activating system and method1982-10-12Lemelson340/825.31 4316385Fingerprinting crystals1982-02-23DeVries et al.73/104 ...
Figure 3a shows its mosaic homeoblastic texture, with calcite crystals that exhibit curved to straight GBSs, even occasionally embayed, in an apparently isotropic microstructure to slightly strained fabric. MGS is 0.4 mm and MFS is ≤0.2 mm, revealing the extremely fine grain of this marble (...
When these corundum crystals are of a bright red color, the material is known as ruby in fuchsite. This material attracts a lot of attention at rock, mineral, gem, and lapidary shows because of the contrasting colors of the fuchsite and ruby, and because the corundum crystals often exhibit...
The method comprises a measurement step (E101), for a set of P "stones" (A100), of the value vij of at least two morphological parameters pj of primary nodular zirconia crystals so as to obtain a set of i vij values; a step of statistical comparison (E102) of sets of i values ...