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DiWolf items are cut, polished, designed and fabricated by Diana & Wolfgang Mueller. They specialize in unusual, classic, rare, obscure or difficult-to-work-with stones.

Diana Diana began making jewelry since the early 80s. The colors, patterns and shapes of the natural stones have been inspirational to her. Influenced by living in a small community and sunny weather allows for more changes in design and components. The originality often comes from the stones and the attempt to showcase them. Learning about minerals lead to using the natural patterns of nature as the true inspiration for her jewelry. Diana cuts stones with Wolfgang and fabricates jewelry.

Wolfgang Wolfgang has been in the lapidary field for over twenty years and a geologist over forty years , partly spent at San Manuel, Arizona. His specialty is ore mineralogy. Ore mineralogy takes some very specialized polishing techniques for the microscopic studies. It was a logical choice to go into the lapidary field, not that logic was key at the time of the transition. The awareness of unique circumstances and stones are the force behind the buying and cutting of our stones.

Diana and Wolfgang belong to two Mineral groups in Tucson, and one in Globe, Arizona. They go mineral collecting whenever possible.

DiWolf is involved in Feb Arizona shows, Pasadena Bead and Design Show and in Denver Gem and Mineral Show, Colorado.

Contact Us:
Phone: 520.896.3197
E-mail: dwm@diwolf.com

General Information

Our LAPIDARY MATERIALS are generally well-known already so we only tried to incorporate them in this information as a brief reference.

"The five stones most associated with Arizona are: fire agate, gem chrysocolla, peridot, petrified wood, and turquoise."
from the "Arizona Centennial" issue of February 2012 Rocks and Minerals magazine by Wolfgang Mueller of DiWolf.

Campbellite - A copper mineral assembage that came from the Bisbee Campbell shaft in the mid 1900's in "lunch boxes" til the day it closed . It does have it's own unique appearane living up to it's own name and it is the only location for this material with this name.

Chrome Tremolite - Calcium Magnesium Iron Silicate and a few other elements thrown in for good measure. - It forms a series with actinolite.- Hardness 5 - 6 - Translucent to transparent, interlocking, long-bladed, prismatic crystals make lapidary procedures difficult. The inclusion of chrome gives it its wonderful green color variations. The ones sold by DiWolf are from St. Lawrence County, NY.

Druzy quartz over Barite - The matrix is silicated limestone that had clear barite crystals growing on it. Subsequently a druzy (lots of very small crystals) quartz grew over the top of the matrix and the barite. A very lovely sparkly black and white mix was created by Mother Nature. We just remove some of the excess material and polish the edges for use in jewelry or display pieces.

Eudialyte - A complex silicate of calcium, sodium, zirconium, cerium, iron and manganese, with hydroxyl and chlorine. - Hardness 5 - 5.5 - Crystals- tabular or prismatic are mostly translucent. Tints or shades of red are thought to be from manganese. The ones sold by DiWolf were from pegmatites in Kipawa, Quebec, Canada.

Kyanite - Aluminum Silicate - Hardness 4 - 7.5 - Crystals are thin brittle and cleavage is pronounced. Has a glassy luster. It is transparent to translucent and often color zoned. Blue is the most common color. The crystals have extreme variation in hardness, making lapidary procedures difficult. The ones sold by DiWolf are mostly from Brazil.

Marcasite (gem) - A historical name used almost 100 years ago when pyrite and marcasite were used interchangeably. In the jewelry trade, marcasite remains the term of choice for what is actually cut pyrite. Both are iron sulfide. Pyrite is cubic and actually quite hard at 6- 6.5.

Purpurite - A manganese iron phosphate. Hardness 4- 4.5 Named for its vivid color on fractured or etched surfaces. Appears almost black with a good polishing. Some of the best cuttable material comes from Namibia, Africa.

Quartz - SiO2 - Silicon dioxide - Hardness 7.

Agate - usually a banded cryptocrystaline quartz that is usually translucent to tranparent

Jasper - also a cryptocrystalin quartz massive and opaque The lapidary material is usually selected for its pictures and landscape scenes.

Serandite - A manganese silicate related to pectolite. - Hardness 4.5- 5. As with most pectolites is difficult to work with because of its perfect cleavage. Best know for its rose-red to pink color and these are from Mont St. Hilaire, Quebec Canada. Shows good chatoyancy (cat’s eye) when properly oriented during cutting. Gemstones are quite rare.

Serpentine - Magnesium iron silicate hydroxide - A group of rock-forming minerals. When it forms rock it is known as serpentinite. It is always a secondary mineral derived front the alteration of magnesium rich silicate minerals and is found in both igneous and metamorphic rocks. The color is usually in the greenish range with a soapy feel, and a greasy luster and commonly opaque. Relatively soft and frequently used for carving.

Sphalerite - Zinc sulfide - Found widespread as the most abundant zinc ore. Hardness - 3..5- 4 From the Greek sphaleros - for deceptive, uncertain for its many and varied modes of occurance. A marvelous gemmy material is found in some of its deposits, but the greatest quantity of gemmy material comes from Santander, Spain. “it is not easy to come by”... J. C. Zeitner

Stichtite - Hydrous magnesium chromium carbonate hydroxide - Hardness 2.5 or less. - It occurs in serpentine rock and is massive, foliated, lamellar, fiberous, or as micaceous scales. It's color is bright lilac to rose-pink. The ones sold by DiWolf are from Tasmania.

Descriptive terms used for minerals are:

This literally means “cluster of grapes” and is used to describe a rock that has a bumpy or grape like surface.

Cabochon (also known as Cab for short)
A stone cut for jewelry. It is usually rounded (or domed) and polished on top, and either flat or slightly rounded on the bottom. Stones can be calibrated (cut to a certain size/shape) or freeform (an abstract shape). This form of cutting is usually used for opaque or translucent stones, but is sometimes used for transparent stones with too many inclusions to make a good faceted stone (faceted is the way diamonds are cut with tables and angles). Cabbing or Cabber are often used to describe the action of cutting a cab and the cutter.

Chatoyancy is a lustrous, cat's eye effect seen in some stones and minerals. In chatoyant material, light is reflected in thin bands within the mineral or stone. Chatoyancy arises either from the fibrous structure of a material, or from fibrous inclusions or cavities within the stone. The name comes from the French word for "cat's eye," because it resembles the slit eye of a cat.

Drusy or Druse
Drusy is a layer of crystals that formed within a cavity of rock. The inner cavity of agate geodes is often lined with drusy of tiny sparkling quartz crystals. These crystals reflect (or appear to be) the color of the rock underneath. Sometimes in the trade minerals that have a fine layer of tiny sparkling crystals can be referred to as druses, such as Cobalto Calcite being called Pink Drusy, or Uvarovite Garnet being called Green Drusy. These minerals can sometimes be cut into designer cabochons for jewelry.

A flaw is an imperfection in a mineral or rock. Flaws include: cracks, chips or “dings”, and some natural inclusions or fractures. A flawless stone is called "clean”. Flaws can sometimes greatly reduce the value of a stone.

Fluorescence is when visible light is emitted from an object during exposure to invisible radiation. Ultraviolet light can produce vibrant red, green, blue, yellow, and other colors in a variety of minerals. Some 500 minerals are fluorescent.

A crack in a mineral or rock that can be natural or man made. It can be naturally healed, meaning something happened, perhaps the ground shifted and cracked, and then the crack was filled with natural material.

The Mohs scale of mineral hardness rates the scratch resistance of various minerals on a scale of 1 to 10 It rates the ability of a harder material to scratch a softer material. The scale runs from 10-Diamond, the hardest substance known to man, to 1-Talc, the softess. Though diamond is the hardest, jade is actually the toughest, or least likely to break.

High Grade/Mine Run
High Grade material is exceptionally good. Also to “high grade” a mineral collection is to sort out the best specimens. Mine Run is usually used to state that the material is sold as it comes out of the mine. The good and bad mixed, it has not been sorted or high graded.

An iridescent object displays many lustrous, changing colors. Iridescence or labradorescence is caused by dispersion of light in cracks and flaws resulting in a rainbow-like play of color (as often seen in an oil slick or a soap bubble). The colors tend to change as the angle of view changes. The word comes from the Greek word “iris”, which means rainbow.

An inclusion is a particle of foreign matter contained within a mineral or gemstone. Inclusions can be solid, liquid, or gaseous. A water filled pocket is called an enhydro. Organic inclusions are only found in Amber. Inclusions are natural and not always considered flaws.

Opaque means no light passes through the material.

When one mineral completely replaces another, but retains the same outer shape of the replaced mineral.

Is rock as it comes out of the ground and has not been worked yet.

Is the term given to stones that are man-made.

An impregnation of a resin to make the rock harder or more durable, so it can be cut easier. This does not effect the attributes of the stone-such as its color. Treated can also refer to process done to change the stones attributes, such as heat-treating, irradiation, dyeing, etc.

Translucent materials allow some light to pass through them, but the light is diffused. The material appears to glow. Transparent means clear or light shines freely through the material.

This is a natural hole or hollow area in rock. Also called a pocket or cavity.

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