Check out the Fluorite with Calcite, Marcasite ps. after Pyrrhotite, Descloizite, Adamite, Chabazite with Stilbite, Galena & Quartz with Pyrite & Dolomite ps. after Calcite, Cuprian Adamite, Quartz var. Amethyst, Fluorite with Calcite & Quartz, Green Quartz (Hedenbergite Included), Calcite, Chalcopyrite & Quartz, Calcite "Rose" on Siderite & Pyrite, Quartz with Hematite, Gypsum var. Selenite on Halite, Beryl var. Aquamarine & Muscovite, Pink Heulandite Crystals on Quartz, Pyrite on Hematite, Barite Crystal Cluster, Siderite & Dolomite with Pyrrhotite, Stellerite Bow-Tie, Red Quartz Crystals on Matrix, Barite with Quartz, Quartz with Calcite & Chalcopyrite, Calcite Crystals on Matrix and Spessartine Garnets with Smoky Quartz & Orthoclase mineral specimens on this page.
Hummingbird Minerals.com
Rocks and Minerals. Rock, Mineral and Crystal Specimens.
Mineral Dealer specializing in cabinet size fine minerals
Boldut Mine, Cavnic, Maramures, Romania (Mined c. 2002)
10.5 x 8 x 5 cm
$450
#B2156 Calcite "Rose" on Siderite and Pyrite
Gheturi Mine near Turt, Oasului Mountains, Satu Mare, Romania (Mined 2003)
9 x 7 x 4.5 cm
$625
#B2158 Quartz with Hematite
Big Creek Mine, Encampment District,
Carbon County, Wyoming, USA
8 x 7 x 6 cm
Ex-Mel and Grace Dyck Collection
$150
Beautiful, complex faceted light purple crystals of Fluorite with a crown of golden Calcite crystals.
Ganzhou city is reputed as the "capital of tungsten" and the "capital of rare earths" in China, thanks to their rich tungsten and rare earth resources.
Light butterscotch colored Chabazite crystals with Stilbite.
Very pretty cluster of lustrous, pale golden Calcite crystals from the famous Minerva Mine. In fine condition.
The terrific Romanian specimens, such as this cluster of Quartz crystals with golden Chalcopyrite, are no longer coming out of the mines in Romania. They are now closed. Get one now, as prices will continue to increase due to lack of fresh supply.
Superb translucent Calcite "Rose" on Siderite and Pyrite and in pristine condition. No longer are these gorgeous specimens coming out of the now closed Romanian mines. This specimen is more fantastic in person !!
Las Salinas, Otuma Mine, Pisco, Ica Department, Peru
7.5 x 6.5 x 5 cm
Ex-Ed David Collection
$550
A gem like 4.7 cm fishtail-twinned, orange, pristine Gypsum crystal on a bed of smaller Gypsum crystals. Very representative of the extraordinary ability of Ed David to select the most aesthetic and best quality specimens. You will not likely find a better specimen of this mineral. Note it still has the Halite association, which is often lost due to dissolution in situ.
#B2162 Beryl var. Aquamarine Crystals and Muscovite
Mt. Xuebaoding, Sichuan Province, China
6 x 5.5 x 3 cm
$1,900
A gorgeous cluster of light blue, gemmy, hexagonal Beryl var. Aquamarine crystals with beveled edges and corners on Muscovite.
This is not your ordinary Indian mineral specimen !!
It has exceptional aesthetics with several pristine and translucent, gemmy, light pink Heulandite crystals on stalactitic formations of fine Quartz. The crystal on the middle right is almost transparent, which is very rare for Heulandite. It is even better in person.
#B2164 Pyrite on Hematite
Rio Marina Mine, Elba Island, Livorno Province, Tuscany, Italy
7.5 x 6 x 2.5 cm
Ex-A.L. Kidwell Collection
$200
Pyrite on Hematite from Elba Island.
Following the Treaty of Fontainebleau, French emperor Napoleon I was exiled to Elba after his forced abdication in 1814.
#B2165 Quartz Cluster Included by Hedenbergite
Seriphos, Kyklahes, Greece
9 x 6 x 1.5 cm
Ex-John Kassionas Collection
$1,200
Exceptional v-shaped cluster of three nicely terminated Quartz Crystals with rich green color due to inclusion of Hedenbergite.
Cerro Warihuyn, Miraflores, Humalies Province, Huanuco Department, Peru
10.5 x 5 x 3 cm
$700
A very fine display of gemmy light yellow Barite blades on matrix. Absolutely minimal damage.
Opposite Side
#B2168 Barite with Quartz
Murray Mine, Elko County, Nevada
9 x 6 x 6 cm
Ex-David & Emily Stoudt Collection
$190
Beautiful specimen of Barite crystals with a sugar-like coating of glistening Quartz.
"Founded as a railroad-promoted townsite and railhead for the White Pine mines in 1869, the town of Elko has served for generations now as the provincial capital of an enormous cattle ranching empire embracing parts of four states. Sixty years ago Lowell Thomas called Elko "the last real cowtown in the American West," and until about 15 years ago that was still a good thumbnail description. But sophisticated new mining technologies permit the harvesting of microscopic particles of the precious metal from mountains (literally) of rock and dirt hauled 200 tons at a time to the crusher. Half a dozen large mining operations produce millions of ounces of gold a year in the region, and even though mining is now on the wane, their impact has transformed the old cowtown into a prosperous young city"
Shizhuyuan Mine, Chenzhou, Chenzhou Prefecture, Hunan Province, China
14.5 x 6.5 x 4 cm
$200
#B2171 Spessartine Garnets with Smoky Quartz and Orthoclase
Tongbei, Fujian Province, China
12 x 5 x 2.5 cm
$250
Gemmy complex crystals of Calcite on matrix.
Very nice specimen with gemmy, dark honey colored Spessartine Garnets and equally gemmy or clear, sharp crystals of Smoky Quartz on Orthoclase. Much better in person !!
#B2192 Marcasite ps. after Pyrrhotite
Herja Mine, Baia Mare, Maramures, Romania (Mined c. 1980's)
11.5 x 9.5 x 6.5 cm
$450
A large cluster of hexagonal Pyrrhotite crystals has been replaced by silvery to light brass colored Marcasite. Looks even better in person.
In geology, a pseudomorph is a mineral compound resulting from a substitution process in which the appearance and dimensions remain constant, but the mineral which makes up the chief component of the compound is replaced by another. The name literally means "false form".
Three kinds of pseudomorph exist:
An infiltration pseudomorph is a pseudomorph in which one mineral or other material is replaced by another. The original shape of the mineral remains unchanged, but color, hardness, and other properties change to those of the replacing mineral. An example of this process (also called substitution) is the replacement of wood by silica (quartz or opal) to form petrified wood in which the substitution may be so perfect as to retain the original cellular structure of the wood. An example of mineral-to-mineral substitution is replacement of aragonite twin crystals by native copper, as occurs at Corococo, Bolivia.
A variety of infiltration or substitution pseudomorphism is called alteration, in which only partial replacement occurs. This happens typically when a mineral of one composition changes by chemical reaction to another of similar composition, retaining the original crystalline shape. An example is a change from galena, lead sulfide, to anglesite, lead sulfate. The resulting pseudomorph may contain an unaltered core of galena surrounded by anglesite that has the cubic crystal shape of galena.
A paramorph (also called allomorph) is a mineral changed on the molecular level only. It has the same chemical composition, but with a different structure. The mineral looks identical to the original unaltered form. This occurs, as an example, in the aragonite to calcite change.
An incrustation pseudomorph results from a process by which a mineral is coated by another and the encased mineral dissolves. The encasing mineral remains intact, and retains the shape of the original mineral or material. Alternatively, another mineral may fill the space (the mold) previously occupied by some other mineral or material.
Pseudomorphs are also common in paleontology. Fossils are often formed by pseudomorphic replacement of the remains by mineral matter. Examples would include petrified wood and pyritized gastropod shells.
Terminology for pseudomorphs is "replacer after original", as in brookite after rutile
(From Wikipedia, the free encyclopedia).
#B2195 Galena and Quartz with Pyrite and Dolomite ps. Calcite
Quite an interesting combination of grayish metallic Galena crystals with golden Pyrite and Quartz - and light brown Dolomite that has replaced Calcite.
#B2196 Cuprian Adamite (Cuproadamite)
Mina La Ojuela, Mapimi, Durango, Mexico
8 x 6 x 1.5 cm
$200
Stunning coverage of lustrous light green Cuprian Adamite on matrix.
Adamite was named after the French mineralogist Gilbert Joseph Adam (1795-1881).
Lustrous deep cherry red crystals of rare Descloizite on matrix.
Coat of Arms of Grootfontein
(From Wikipedia, the free encyclopedia)
#B2194 Adamite
Ojuela Mine, Mapimi, Durango, Mexico
5.4 x 3.6 x 1.5 cm
$250
A very large, beautifully transparent wheel of sparkling Adamite crystals with a small amount of accenting Limonite matrix.
#B2200 Siderite and Dolomite with Pyrrhotite
Morro Velho, Nova Lima, Minas Gerais, Brazil
9.5 x 7.4 x 2.2 cm
Ex- Dr. Gary Hansen Collection
$600
A gorgeous segregated crust of lustrous, gemmy, yellow-green Siderite blades and translucent light gray Dolomite rhombs, the latter richly dressed with bright, brassy, tabular, hexagonal Pyrrhotite crystals - from the famous 1960's find at the Morro Velho Gold Mine of Brazil. Seldom available in this quality.
#B2198 Fluorite with Calcite and Quartz
Dong Po Mine, Hunan Province, China
9.5 x 8.5 x 6 cm
Ex- Martin Zinn Collection
$250
A beautiful light teal colored clear Fluorite crystal is nestled at the top of this specimen above a cavity covered with Calcite and Quartz crystals.
#B2199 Green Quartz (Hedenbergite Included)
Mega Xhorio, Serifos Island, Greece
7.9 x 5.5 x 5 cm
Ex- Richard Hauck Collection; Ex- G. Gauthier Collection
$350
Beautiful clusters of Green Quartz richly included with Hedenbergite. A classic specimen from Serifos Island
Beautiful combination of Quartz crystals coated with white Calcite and minor Chalcopyrite. There are no more of these wonderful specimens coming out of the Romanian Mines - as they are now closed !
Stellerite is the rarer cousin of the much more common zeolite stilbite. Like Stilbite, Stellerite crystals can aggregate together to form a structure resembling wheat sheafs. This hourglass structure (Bow-tie) looks like several crystals stacked parallel to each other with the tops and bottoms of this structure fanning out while the middle remains thin.
