View allAll Photos Tagged Repeating
Repeating pattern developed for the new Woodstock Farmers' Market coffee cups. Printed 10oz and 16oz cups. Complete with a handy "fill-o-meter" so you know when it's time for a refill.
A recent trip to Pontiac found it to be in a near ghost town existance. I couldn't believe how desolate it was. Image making was a quiet experience, but fruitful.
My first swimwear design. They called it "hibiscus bikni", but there were no hibiscus in the design • designed exclusively for Esprit • Photo source: Esprit catalog
Daily Shoot #205 - Iteration or repetition of a subject makes for good composition. Look for a repeating pattern today and make a photo.
The word is about, there's something evolving,
whatever may come, the world keeps revolving
They say the next big thing is here,
that the revolution's near,
but to me it seems quite clear
that it's all just a little bit of history repeating
The newspapers shout a new style is growing,
but it don't know if it's coming or going,
there is fashion, there is fad
some is good, some is bad
and the joke is rather sad,
that its all just a little bit of history repeating
CP 471 leaves Minnesota City, passing the site of the swinging foot bridge that once crossed Garvin Brook. The train is on a bridge that was built to replace one destroyed in the flood of 2007, 60 years after the previous foot bridge was lost.
November 24th, 2016
The mineral pyrite (/ˈpaɪraɪt/),[1] or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral.
Pyrite
Pyrite - Huanzala mine, Huallanca, Bolognesi, Ancash, Peru.jpg
Intergrowth of lustrous, cubic crystals of pyrite, with some surfaces showing characteristic striations, from Huanzala mine, Ancash, Peru. Specimen size: 7.0 × 5.0 × 2.5 cm
General
CategorySulfide mineral
Formula
(repeating unit)FeS2
Strunz classification2.EB.05a
Dana classification2.12.1.1
Crystal systemCubic
Crystal classDiploidal (m3)
H-M symbol: (2/m 3)
Space groupPa3
Unit cella = 5.417 Å, Z = 4
Identification
Formula mass119.98 g/mol
ColorPale brass-yellow reflective; tarnishes darker and iridescent
Crystal habitCubic, faces may be striated, but also frequently octahedral and pyritohedral. Often inter-grown, massive, radiated, granular, globular, and stalactitic.
TwinningPenetration and contact twinning
CleavageIndistinct on {001}; partings on {011} and {111}
FractureVery uneven, sometimes conchoidal
TenacityBrittle
Mohs scale hardness6–6.5
LusterMetallic, glistening
StreakGreenish-black to brownish-black
DiaphaneityOpaque
Specific gravity4.95–5.10
Density4.8–5 g/cm3
Fusibility2.5–3 to a magnetic globule
SolubilityInsoluble in water
Other characteristicsparamagnetic
References[2][3][4][5]
Pyrite cubic crystals on marl from Navajún, La Rioja, Spain (size: 95 by 78 millimetres [3.7 by 3.1 in], 512 grams [18.1 oz]; main crystal: 31 millimetres [1.2 in] on edge)
Pyrite's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold. The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal.[6][7]
The name pyrite is derived from the Greek πυρίτης λίθος (pyritēs lithos), "stone or mineral which strikes fire",[8] in turn from πῦρ (pyr), "fire".[9] In ancient Roman times, this name was applied to several types of stone that would create sparks when struck against steel; Pliny the Elder described one of them as being brassy, almost certainly a reference to what we now call pyrite.[10]
By Georgius Agricola's time, c. 1550, the term had become a generic term for all of the sulfide minerals.[11]
Pyrite under normal and polarized light
Pyrite is usually found associated with other sulfides or oxides in quartz veins, sedimentary rock, and metamorphic rock, as well as in coal beds and as a replacement mineral in fossils, but has also been identified in the sclerites of scaly-foot gastropods.[12] Despite being nicknamed fool's gold, pyrite is sometimes found in association with small quantities of gold. A substantial proportion of the gold is "invisible gold" incorporated into the pyrite (see Carlin-type gold deposit). It has been suggested that the presence of both gold and arsenic is a case of coupled substitution but as of 1997 the chemical state of the gold remained controversial.[13]
Uses
An abandoned pyrite mine near Pernek in Slovakia
Pyrite enjoyed brief popularity in the 16th and 17th centuries as a source of ignition in early firearms, most notably the wheellock, where a sample of pyrite was placed against a circular file to strike the sparks needed to fire the gun.[14]
Pyrite is used with flintstone and a form of tinder made of stringybark by the Kaurna people, people of South Australia, as a traditional method of starting fires.[15]
Pyrite has been used since classical times to manufacture copperas (ferrous sulfate). Iron pyrite was heaped up and allowed to weather (an example of an early form of heap leaching). The acidic runoff from the heap was then boiled with iron to produce iron sulfate. In the 15th century, new methods of such leaching began to replace the burning of sulfur as a source of sulfuric acid. By the 19th century, it had become the dominant method.[16]
Pyrite remains in commercial use for the production of sulfur dioxide, for use in such applications as the paper industry, and in the manufacture of sulfuric acid. Thermal decomposition of pyrite into FeS (iron(II) sulfide) and elemental sulfur starts at 540 °C (1,004 °F); at around 700 °C (1,292 °F), pS2 is about 1 atm.[17]
A newer commercial use for pyrite is as the cathode material in Energizer brand non-rechargeable lithium batteries.[18]
Pyrite is a semiconductor material with a band gap of 0.95 eV.[19] Pure pyrite is naturally n-type, in both crystal and thin-film forms, potentially due to sulfur vacancies in the pyrite crystal structure acting as n-dopants.[20]
During the early years of the 20th century, pyrite was used as a mineral detector in radio receivers, and is still used by crystal radio hobbyists. Until the vacuum tube matured, the crystal detector was the most sensitive and dependable detector available—with considerable variation between mineral types and even individual samples within a particular type of mineral. Pyrite detectors occupied a midway point between galena detectors and the more mechanically complicated perikon mineral pairs. Pyrite detectors can be as sensitive as a modern 1N34A germanium diode detector.[21][22]
Pyrite has been proposed as an abundant, non-toxic, inexpensive material in low-cost photovoltaic solar panels.[23] Synthetic iron sulfide was used with copper sulfide to create the photovoltaic material.[24] More recent efforts are working toward thin-film solar cells made entirely of pyrite.[20]
Pyrite is used to make marcasite jewelry. Marcasite jewelry, made from small faceted pieces of pyrite, often set in silver, was known since ancient times and was popular in the Victorian era.[25] At the time when the term became common in jewelry making, "marcasite" referred to all iron sulfides including pyrite, and not to the orthorhombic FeS2 mineral marcasite which is lighter in color, brittle and chemically unstable, and thus not suitable for jewelry making. Marcasite jewelry does not actually contain the mineral marcasite. The specimens of pyrite, when it appears as good quality crystals, are used in decoration. They are also very popular in mineral collecting. Among the sites that provide the best specimens are Soria and La Rioja provinces (Spain).[26]
In value terms, China ($47 million) constitutes the largest market for imported unroasted iron pyrites worldwide, making up 65% of global imports. China is also the fastest growing in terms of the unroasted iron pyrites imports, with a CAGR of +27.8% from 2007 to 2016. wikipedia
This is a really small part in Silpakorn University Bangkok Campus.
It is under the food cord building, and no one notice it.
When I'm out of ideas, I look to the side and try to see the subject at first sight. This is an inflatable mattress against the wall of my room. I think it worked!
Make a photograph that features repeating patterns. #ds515
My friend Patrick visited me today from Springfield (where the Simpsons live).
We went to the Boston Museum of Fine Arts to see a show of works by Antonio Lopez Garcia, but we were fascinated as we walked in by this remarkable work of Josiah McElheny. I can't explain why we aren't reflected in the glass objects or the mirrors around them. although we are reflected in the mirrored surface of the structure. The longer we looked at it the more mysterious it became.
"Endlessly Repeating Twentieth Century Modernism" (2007) by Josiah McElheny, American born in 1966. Executed in hand-blown mirrored glass, low-iron and transparent mirror, metal, wood, electric lighting (information from the Museum label).
Project 365 - At the courthouse where my recent citizenship ceremony took place, the architecture of the building featured very prominent lines and curves.
Maybe if I just keep repeating it like a mantra...
I jest. Winter IS pretty. It's the cold I could do without.