Check out the Bi-Colored Beryl, Amethyst (Spirit Quartz), Fluorapophyllite on Choral (Quartz), Fibrous Calcite Cluster, Green Gypsum var. Selenite, Blue Barite, Spessartine Garnets with Smoky Quartz, Fluorite & Quartz, Marcasite ps. after Pyrrhotite, Cavansite Rosettes and Stilbite, Yellow Fluorite, Rutile on Hematite, Pointed Fluorapophyllite Crystal with Stilbite, Cuprian Adamite, Herkimer Diamonds, Stilbite Crystals on Matrix, Calcite with Quartz & Chalcopyrite, Thomsonite, Fluorite with Barite, Mimetite and Sulfur mineral specimens on this page.
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Rocks and Minerals. Rock, Mineral and Crystal Specimens.
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Great specimen from a limited new find in the Erongo Mountains of Namibia with bi-colored Beryl crystals with green tips to 1.5 cm shooting out in all directions from a matrix of acicular Schorl.
Nice plate of Spirit Quartz (Cactus Amethyst) with browish tinge.
Aesthetic sharp pointed twin crystal of gemmy green Fluorapophyllite on fine Quartz matrix.
Beautiful mass of fiber-like brown Calclite crystals in sheath-like formations.
Numerous delicate light green clear elongated Selenite crystals form this stunning specimen.
Pretty specimen of pale blue glassy thick blades of Barite in a shallow vug-like cavity.
Very good large plate of dark red Spessartine Garnets with small accenting Smoky Quartz crystals.
A nice pale blue-green Fluorite crystal perched in a cluster of Quartz crystals.
A large cluster of hexagonal Pyrrhotite crystals has been replaced by silvery to light brass colored Marcasite. Looks even better in person.
A really attractive specimen of lustrous rich blue rare Cavansite rosettes with small translucent Stilbite crystals on fine Quartz matrix.
A wonderful example of botryoidal yellow Fluorite (a double yolker!!) on Quartz. These are unique to India.
A very nice specimen with a thick brush-like growth of golden Rutile crystals on Hematite.
This gorgeous specimen of gemmy pointed crystals of Fluorapophyllite on lustrous translucent white Stilbite is from a new limited find in India. I have more, including some very nice minatures.
Stunning coverage of lustrous light green Cuprian Adamite on matrix.
Adamite was named after the French mineralogist Gilbert Joseph Adam (1795-1881).
A crown of sharp Herkimer Diamonds (Quartz) adorn this aesthetic specimen. A few dings, but still a nice specimen that looks even better in person.
Nice plate of caramel colored Stilbite from New Jersey !!
Fine, intricate white Calcite crystals cover this pretty specimen with some accenting Quartz and minor Chalcopyrite.
Another fine botryoidal yellow Fluorite (4.5 x 5.5 cm) nestled in a recess of this Quartz plate. Resembles an
egg in a frying pan.
Thomsonite is one of the rarer Zeolites and this is a very nice one.
Purple Fluorite crystals with darker edges in matrix with some accenting light yellow fans of Barite.
Great balance of golden Chalcopyrite crystals with contrasting white Calcite and minor Quartz on this specimen.
Very rich covering of cauliflower-like clusters of yellow Mimetite crystals on this specimen.
Gemmy dark honey colored Spessartine Garnets are nicely scattered on this specimen with minor Smoky Quartz and a rich carpet of silvery Mica.
Wonderful color and glow from this dense mass of gemmy Sulfur crystals.
Deep purple cluster of Fluorite with a 7 cm double terminated Quartz crystal jutting from the left top and another smaller one (3 cm) shooting out from the middle perpendicular to the plane of the presenting face of the specimen.
Jalgaon is a city in western India, in northern Maharashtra state, Jalgaon District on the northern Deccan Plateau. Located within the productive, irrigated agricultural region of Kandesh, Jalgaon is a significant collection and distribution center of agricultural goods. Jalgaon is an important center for cotton-textile and vegetable oil mills, particularly groundnut-oil and hydrogenation plants. Jalgaon is also well known for banana production. The city is also famous for its gold market, which has reputation of being pure.
Just up the Ohio River from Elizabethtown, Illinois is Cave-In-Rock. Named for a cave visible from the Ohio, the village was settled approximately in 1816 but was not incorporated until 1901. The area is rich in colorful history mainly connected to the “Cave” and what went on there. Inhabited by Native Americans prior to European settlement and then becoming a haven for river pirates and counterfeiters, it is today a part of the Cave-In-Rock State Park.
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
