Mineral include: lead associated specimens
from Broken Hill, Australia, classic British locations, Moldavites from
Czech Republic, and zeolites from India.
Moldavite Tektite
Moldavites are Earth matter made amorphous
by a meteor impact. Most tektites are black but low iron content as
made the tektites of Moldavia Valley in Czech Republic vibrant bottle
green color. The 10.7 gram moldavite is 1/4 inch thick bowed sheet
with bubbly rippled surface. 1 inch by 1 3/8 inch
Moldavites are Earth matter made amorphous
by a meteor impact. Most tektites are black but low iron content as
made the tektites of Moldavia River Valley in Czech Republic vibrant
bottle green color that is gem quality. The 15.7 gram moldavite has
a bubbly rippled surface. 7/16 inch thick 1 inch by 1 3/4 inch.
All sides of the 3 3/4 inch by 2 inch
by 1 1/2 inch mineral specimen are coated with orange crocoite prisms.
Vugs on the Tasmania mineral specimen hold large crystals. Crocoite
is lead chromate which is formed as a secondary mineral from alteration
of hydrothermal deposits.
Bi-pyramidal crystals of sphalerite
and galena, some with a reddish resinous luster and others with a
metallic luster, coat the exterior of the formation that has sphalerite
in the center, a concentric layer of quartz. Sphalerite is the primary
ore in zinc. This mineral specimen came from Brownley Mine, Nethead,
Cumbria, England and is 1 ½ inches by 1 3/8 inches, with a weight
of 76 grams.
Sphalerite, zinc sulfate, is the primary
ore of zinc. The crystals on this specimen from Small Cleugh Mine,
Nethead, Cumbria, England, have a red color, resinous luster, and
complex tetrahedral crystal forms that resemble octahedrons, some
with cubic, dodecahedron, and tristetrahedron faces. There is some
quartz present on the surface. The 105 gram sphalerite mineral specimen
is 2 ½ inches by 1 ¾ inches by 1 inch thick.
Distinct tetragonal, bipyramid, crystals
of sphalerite (zinc sulfide) are combined with clear quartz crystals.
There is a druzy coating of quartz, some with orange-brown color.
The 197 gram mineral specimen from Nentsberry Mine, Nenthead, Cumbria,
England is 3 ½ inches by 2 ½ inches by 1 1/8 inches.
The metallic luster of sphalerite (black jack), with sparkling plates,
composed of quartz mini-crystals forms a spectacular mineral specimen.
This cabinet specimen has is solid sphalerite and quartz and has no
other rock matrix.
A thin hard crust of hematite crystals
is a shell that once covered kidney shaped hematite formation. Thin
blade crystals produce metallic glints within the 2 inch by 1 1/4
inch by 1/8 inch mineral specimen. White tufts of aragonite are present
on one corner of the mineral specimen from from Beckermet Mine, Egremont,
Cumbria, England.
The three pyrite crystals are from Navajon,
La Rioja, Spain. This location produces the finest cubic pyrite crystals.
The sharp crystal structure and lustrous metallic surface, produce
a distinctive mineral display. The crystals are 1 1/8 inch, 3/4 inch
twin, and 9/16 inch crystals. The photograph shows the sides with
ingrown faces. The collection can be arranged with all smooth sides
showing. The ingrown areas have a layered, stepped structure.
These three pyrite crystals are from
Navajon, La Rioja, Spain. This location produces the finest cubic
pyrite crystals. The sharp crystal structure, with lustrous metallic
surface, make this pyrite collection an excellent mineral display.
The crystals are 1 1/8 inch, ¾ inch twin, and 9/16 inch crystals.
Tabular barite crystals (Barium Sulfate)
on matrix from Ronneburg, Thuringen, Germany are dark amber to cognac
color. The barite mineral specimen is 3 inches by 1 ¼ inches by 1
¼ inches.
Clusters of spear point shaped crystals
have stacked chevron faces, pale gold color and bright metallic luster.
The 1 5/8 inch by 1 1/4 inch by 1 inch marcasite weighs 50 grams.
Location: Bilina Mine, Czech Republic.
Interpenetrating crystals of siderite,
iron carbonate, are flat disks that fill a vug in quartz and iron
matrix. The siderite mineral specimen, from Lill Mine, Pribram, Czech
Republic, is 2 ¾ inch by 2 ¼ inch by 1 ½ inch
thick.
A 1/2 inch thick metallic matrix including
sharp prisms of bournonite, lead copper antimony sulfide has stacks
of tiny pink rhodochrosite rhombohedra and delicate quartz formations
including a wheel of radiating needle crystals. The classic Eastern
European mineral specimen is from Kapnik, Romania. 1 1/2 inch by 1
inch by 1 inch
On a bed of black lustrous bournonite,
including cogwheel twins, sharp yellow arsenopyrite crystals, and
clear quartz prisms are mixed with tabular rhodochrosite crystals
that have drusy coating of clear buff pink rhodochrosite. Clear flat
calcite crystals with tri corner terminations sprinkle the top of
the 2 inch by 1 1/2 inch by 1 1/2 inch mineral specimen from Trepca,
Yugoslavia.
The brown vesuvianite crystals, ¼ inch
to ¾ inch, are bi-pyramidal on short prisms with slight translucency
and gem luster. Vesuvianite, alkaline calcium, iron, magnesium silicate,
is formed during contact metamorphosis of impure limestone deposits.
The 2 ½ inch by 2 ½ inch by 1 ½ inch thick vesuvianite specimen is
from Predazze, Fasse Valley, South Tyrol, Italy.
The brown vesuvianite crystals, 1/4
inch to 3/8 inch, are bi-pyramidal shaped, with slight translucency
and gem luster. Vesuvianite, alkaline calcium, iron, magnesium silicate,
is formed during contact metamorphosis of impure limestone deposits.
The 3 inch by 2 ½ inch by 2 inch thick, vesuvianite specimen
is from Pitigliano, Grosseto (Tuscany), Italy.
The India zeolite is stibnite; a silicate
that forms in air pockets in basalt lava. The stilbite crystals are
splayed sheaves of lustrous, peach colored tabular crystals on green
basalt matrix. 1 7/8 inch by 1 1/2 inch by 1 1/4 inch.
The 65 gram, 1 5/8 inch by 1 inch by
7/8 inch, clear spar calcite rhombohedron crystal with attached portion
from India displays a prism when back lit.
Needle crystals of cerrusite, lead carbonate,
oriented in scattered directions, fill a vug and underlie a brown
sugar mineral coating. The 3 inch by 2 inch by 1 inch mineral specimen
has these secondary minerals coating the heavy country rock. Location:
South Mine, New south Wales, Australia.
Sharp bladed crystals of cerrusite,
lead carbonates are replacing the black anglesite rhombohedra (lead
sulfate). The bright lead crystal in reticulated, or latticed structure
stands in stark contrast to the black matte finish of the matrix.
The mineral specimen, from South Mine, Broken Hill, New South Wales
Australia, is 1 ½ inch by 1 ¾ inch by 1 ½ inch,
weighing a hefty ½ pound.
A ½ inch cerrustie crystal, lead carbonate,
with some smaller crystals and a sprinkling of Manganoan smithsonite,
zinc carbonate are present on the 1 ¾ by 1 13/4 inch by 1 inch mineral
specimen from South Mine, Broken Hill, New South Wales, Australia.
Clear, gemmy, rounded rhombohedron crystals
of smithsonite, zinc carbonate are stacked in several areas, on the
2 ¾ inch by 1 ¾ inch by 1 inch thick, matrix rock. The smithsonite
mineral specimen is from Broken Hill, New South Wales, Australia.
A solid crystal mass of cerrustite,
lead carbonate, has been replaced by angelesite, lead sulfate. The
angeliste/cerrustie psudomorph is from 5th Mine, Broken Hill, New
South Wales, Australia.
Tiny green, rounded octohedron, smithsonite
crystals cover one face, 2 inches by 1 inch, of the 3 inch by 2 inch
by 1 ¼ inch matrix. Smithsonite, zinc carbonate, is formed as a secondary
mineral in weathered zones of zinc deposits. This colorful, smithsonite,
mineral specimen is from Broken Hill, New South Wales, Australia.
The lead ore matrix has a chocolate
brown, mineral coating with yellow spheres of mangan smithsonite,
zinc carbonate, and cerrusite, lead carbonate, in clear crystal blades.
The mineral specimen from South Mine, Broken Hill, Australia is 3
¼ inches by 1 ¾ inches by 1 ¾ inches.
This page is all calcite mineral specimens
from North and South America, Africa, and other localities around
the world. Calcite has more crystal forms than any other mineral.
Cruise this page to see some of the calcite crystal varieties. Tsumeb
calcites have many secondary metal minerals.
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