Feldspar Collection

Feldspar Crystals from Summit of Mount Erebus (Natural Size), 1909. Specimens of crystallised magma from the volcano Erebus

Polished slab of labradorite
Labradorite (calcium sodium aluminum silicate) can seem dull and grey until the light hits correctly, then an array of colours can be observed glowing on the surface

Moonstone gemstones. This orthoclase mineral (potassium aluminium silicate) has been cut and polished to produce semi-precious gemstones

Cassiterite Partly Replacing Orthoclase, Wheal Coates, St Agnes, Cornwall, England
Twinned crystals of orthoclase feldspar partially replaced by cassiterite. This rare kind of replacement, or partial pseudomorph, is best seen in specimens from Wheal Coates

Scarab: Uninscribed, Egypt, Middle Kingdom (?), Dynasties 11-12 (about 2055-1773 BCE)

Hornblende granite rocks, California

Picture No. 11806836
basalt porphry with feldspar phenocrysts, Chinese writing stone California, igneous rock basalt porphry with feldspar phenocrysts Date:

Quartz-feldspar porphyry C016 / 6206
Quartz-feldspar porphyry. Geological specimen collected during Scotts British Antarctic Expedition 1910-1913 (also known as the Terra Nova expedition)

Quartz-feldspar porphyry
Geological specimen collected by Scotts British Antarctic Expedition 1910-1913, also known as the Terra Nova expedition. It had a broad scientific programme and collected thousands of geological

Illustration of feldspar

Illustration of a piece granite made up from the minerals quartz, feldspar and mica

Cross section of planet Earth showing the lower mantle, made by olivine, pyroxene and feldspar. Temperature 1800 - 2800A Celsius

Picture No. 11091678
Labradorite a feldspar material, polished Date:

Picture No. 11050135
Arfvedsonite & Feldspar Zomba, Malawi Date:

CA, Joshua Tree NP, Aplite vein in Monzogranite formation

USA, California and Nevada, Death Valley National Park, Sand Dunes in Mesquite Flat, and Cottonwood Mountains in the background

Canada, Newfoundland and Labrador, Northern Labrador coast, Hopedale (aka Agvituk). Labradorite rock quarry, local feldspar mineral with blue flecks of color

Labradorite, a form of feldspar, close-up

Tourmaline embedded in feldspar rock

Feldspathic gritstone

Ilmenite crystals in oligoclase feldspar groundmass, close-up

Oval Sunstone gemstone

Massive oligoclase

Labradorite C016 / 5698
Labradorite. Close-up of the surface of a rich blue specimen of the mineral labradorite (calcium sodium aluminum silicate)

HED meteorites, light micrograph C013 / 7774
HED meteorites. Polarised light micrograph of thin sections of two HED (howardite, eucrite and diogenite) meteorites recovered from Antarctica, showing the crystalline structure

Granite C013 / 6563
Granite is an igneous rock, one that formed from the cooling of molten rock. Within the granite are grey and pink feldspar crystals

Feldspar, collected by Dr Benza c.1837. NHM specimen number: BM 650

Orthoclase (potassium aluminum silicate) is a major granite forming mineral. Specimen from Brevik, Norway

Cassiterite pseudomorphous after orthoclase
Brown granular cassiterite (tin oxide) have replaced twinned orthoclase crystals. Wheal Coates, St. Agnes, Cornwall

Plate 4a from Histoire naturelle? (1789)
Plate 4a Mineralogie, [unfinished] from Histoire naturelle: ou, Exposition des morceaux, les mieux choisis pour servir? (1789) by by Swebach Desfontaines

Slice of the lunar meteorite Northwest Africa 482
A slice of lunar meteorite Northwest Africa 482. This meteorite is very rich in the feldspar mineral anorthite, which give it its pale colour

Microscope image of the Brachina meteorite, the type specimen of the Brachinite meteorites. Brachinites are composed mostly of olivine with minor amounts of pyroxene and plagioclase

Amazonite

Labradorite carving

Labradorite
A close-up of the surface of a rich blue specimen of the mineral labradorite from labrador. Labradorite (calcium sodium aluminum silicate)

Observing structure of rock
Looking at fresh granite under a microscope to study structure, granular composition can clearly be seen

A group of feldspar specimens
Amazonstone crystals and gems, pin set with sunstone, and moonstones. The feldpars are significant rock building minerals

Polished white granite. Granite is an igneous rock, one that formed from the cooling of molten rock. Within the granite are grey and pink feldspar crysals

Sandstone Mesas with Rainbow, Utah. tif C009 / 7042
The formation of sandstone involves two principal stages. First, a layer or layers of sand accumulates as the result of sedimentation, either from water (as in a stream, lake)

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Feldspar, a versatile mineral with captivating beauty, has left its mark throughout history. From the summit of Mount Erebus in 1909, Feldspar crystals emerged in their natural size, showcasing their exquisite allure. These crystals possess an ethereal charm that mesmerizes all who behold them. Intriguingly, a polished slab of labradorite reveals the enchanting play of colors within Feldspar. Known as the "rainbow stone, " it captivates with its iridescent hues and mystical aura. Similarly, moonstone gemstones exude a gentle glow that evokes dreams and tranquility. However, Feldspar's influence extends far beyond mere aesthetics. In Wheal Coates, St Agnes, Cornwall, England, Cassiterite partly replaces Orthoclase to create a unique fusion of minerals. This remarkable occurrence showcases nature's ability to transform and adapt. Delving into ancient civilizations brings us to Egypt during the Middle Kingdom era (about 2055-1773 BCE). An uninscribed scarab crafted from Feldspar serves as evidence of its significance in Egyptian culture and beliefs. This precious artifact carries echoes of bygone times and symbolizes eternity. Moving across continents to California unveils another facet of Feldspar's presence - hornblende granite rocks dominate the landscape. These rugged formations display strength and endurance while reminding us of nature's raw power. From majestic mountain peaks to ancient artifacts and rocky landscapes alike; feldspar leaves an indelible impression wherever it is found. Its versatility continues to fascinate geologists and enthusiasts alike as they uncover new wonders hidden within this extraordinary mineral.