Stones are polished by tumbling them around inside a rock polishing machine barrel filled with water and polishing grit. A variety of course silicone carbide powdered grits are applied, each designed to smooth the stones further with each application, rubbing away the rough stone surface in order to give the stone a polished shine.Know More
Fill the rock polishing machine barrel about three-fourths full with the stones that you wish the polish. The stones should be under 1 inch in diameter and of the same hardness to avoid crushing softer stones with harder stones in the mix. One or two larger stones can be added to the smaller stone mix if desired. Shake the barrel to settle the stones on the bottom. Pour water into the barrel until it covers the stones, and then add 80-grit powder to the water, using about 1 tablespoon for a barrel of 1.5 pounds. Place the top onto the barrel tightly.
Start the rock polishing machine to begin tumbling the stones. The grit will run over the surfaces of the stones, smoothing down the rough surfaces slightly. Run the machine for three to 10 days, checking the stones periodically. Softer stones will take less time. When the stones appear to not be getting any smoother, stop the machine, and clean the stones and barrel of the grit.
Place the stones back into the barrel. Add a 220-grit powder and enough water to cover the stones. Run the machine for five to six days, then clean the stones and barrel again. Repeat the process for a seven-day run using 400-grit powder. Clean the stones, and remove any broken or cracked ones from the pile.
Repeat the tumbling process a final time for seven days, using 1 tablespoon of cerium oxide to create a shine on the stone surfaces.
According to the Encyclopaedia Britannica, ventifacts are formed when windblown sand or other particles erode the surface of stone, resulting in polished, flattened facets. These facets are cut in sequence and correlate to the direction of the wind that blew the sound that eroded them. Ventifacts are found mainly in arid regions or areas with little to no vegetation.Full Answer >
Lladr? figurines began in 1953 as artwork made by three brothers in Spain. By the 1970s, Lladr? figurines were considered collectibles all around the world. Because there are counterfeit Lladr? figurines on the market, collectors must be able to identify authentic Lladr? works of art.Full Answer >
Pricing Precious Moments collectibles requires locating their unique model number and production year mark. This identifying information allows an owner to determine current market value in numerous pricing guides such as the Professor's Precious Moments Figurine Price Guide.Full Answer >
Rare Hummels that are regarded as especially valuable include "Apple Tree Boy," "Little Goat Herder," "Going to Grandma's," and "Globe Trotter." Hummel figurines made before 1949 or standing higher than 12 inches can sell for thousands of dollars. The value of a Hummel figurine is also higher if it is in its original box.Full Answer >