The mineral apatite—Ca 5 (PO 4) 3 (F,Cl,OH)—is widely distributed in planetary materials. Terrestrial igneous apatite incorporates S as sulphate and C as carbonate, both substituting for ...

The index JS means jointing density (FF / m) and JS ≈ ≈ 35 for the apatite deposits. The index JС in closed joints is varied from 3 to 40. We assume JС = 20. Water ingresses lower the strength of rock mass at an approximate reduction factor K = 0.8. the other reduction factors (weathering, etc.) are neglected.

Apatite, a group of phosphate minerals, is a gemstone that is as diverse as it is beautiful. It is renowned for its wide range of colors, from the deep blues of the ocean to the lush greens of a forest, making it a coveted choice for jewelry and decorative pieces. Apatite's name, derived from the Greek word "apatao," meaning to deceive ...

Apatite (Ca 5 (PO 4) 3 (OH,F,Cl)) is an ubiquitous accessory phosphate mineral found in many types of rocks and environments. This is particularly true with regards to ore deposits. This mineral has several key characteristics that are very useful when one is interested in the characterization and/or the dating of the circulations of fluid …

During feldspar mining the quarry workers sometimes encountered rare and unusual minerals. (The mountain is named after a phosphate mineral called apatite, which was found as beautiful deep purple crystals at the Pulsifer Quarry on the west side of the hill. See Figure 2). These minerals might be put aside to be sold to uraged

Phosphorus is obtained from the mining of phosphate rocks, mainly the mining of minerals belonging to the apatite group; these ores represent a limited and non-renewable resource [].The composition of apatite, alongside its complex substitution scheme, affects not only the obvious phosphate grade attainable in a concentrate, but …

Today amateurs may still search the mine tailings for Apatite, Tourmaline, and Quartz specimens (specific rules apply). With assistance from a Land and Water Conservation Fund matching grant, five kilometers (3.1 miles) of multi-purpose trails were constructed in the summer of 1994 within the park to serve all outdoor enthusiasts.

Apatite is a superb mineral by which to investigate the nature of fluids that have passed through and altered a rock (metasomatic processes). Its ubiquity allows it to act as a …

Apatite is the name for a group of minerals with the general formula A 5 (TO 4) 3 Z (Gaines et al., 1997, pp. 854–868) in which A represents a range of cations, usually calcium, strontium, lead, and barium; uranium or rare earths may also be incorporated; T is usually P, but As and V do form other minerals that crystallize with the same ...

minerals Article The Crystallinity of Apatite in Contact with Metamict Pyrochlore from the Silver Crater Mine, ON, Canada Christopher Emproto 1, Austin Alvarez 1, Christian Anderkin 2 and John Rakovan 1,* 1 Department of Geology and Environmental Science, Miami University, Oxford, OH 45056, USA; [email protected] (C.E.); …

One of the most emblematic trace elements is fluorine, existing in the form of fluoride ions, and mostly found in the apatite biomineral (99% of the F body burden). The fluoride content varies strongly depending on dietary uptake, though in normal bone it constitutes 0.05% to 0.1%.

1. Introduction. Phosphate ores are made up of several types of minerals, the most common being calcium phosphates from the apatite supergroup. The manufacture of fertilizers in Brazil uses apatite, a type of raw material from the rare occurrences of carbonatitic rocks, with >80 % of the production capacity of apatitic concentrates …

Pulsifer Quarry & Dionne extension, West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA Apatite on Quartz. Specimen is from the collection of Harvard University, Cambridge, Massachusetts, USA #108943 (1974). Scale at bottom of image is an inch with a rule at one cm.

Apatite crystals are a favorite among collectors with their stubby, terminated, hexagonal prisms, glassy transparency, and soft, yellow-to-greenish-yellow or blue mineral colors.These beautiful crystals rank high on blue gems and minerals lists.Much is mined in Mexico.. However, most of the apatite in the Earth's crust occurs not as macrocrystals, …

July 1, 2023. 0. Apatite crystals are a favorite among collectors with their stubby, terminated, hexagonal prisms, glassy transparency, and soft, yellow-to-greenish-yellow or blue mineral colors. These beautiful …

Physical Properties. Apatite is best known for its use as an index mineral with a hardness of 5 in the Mohs Hardness Scale. It is usually green in color, but can be yellow, brown, blue, purple, pink, or colorless. These colors are often so vivid that apatite has frequently been cut as a gemstone. Apatite is a brittle material.

Apatite (Ca 5 (PO 4) 3 (OH,F,Cl)) is an ubiquitous accessory phosphate mineral found in many types of rocks and environments. This is particularly true with regards to ore deposits. This mineral has several …

With lenticular crystals of Siderite and small crystals of Pyrite. The specimen comes from a recent find in Panasqueira. Minas da Panasqueira, level 1, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Portugal (07-08/2020) Specimen size: 8.7 × 8.2 × 4.9 cm = 3.43" × 3.23" × 1.93".

I bought this exceptional specimen at the mines, maybe around 2002 when high quality pockets were found while working the upper levels of the mine. The color of this apatite crystal is truly rare, it is very difficult to define it because it depends of the type of light and also how it reaches the crystal.

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Apatite Gem Guide and Properties ChartmineralsIs apatite a gemstone?Apatite is a mineral and commonly known as a type of phosphorus chemical which is very much required in the process of photosynthesis. It is also a gemstone that is transparent and very rarely found.

Apatite

greatminingHow hard is apatite?Apatite has a relatively consistent hardness and serves as the index mineral for a hardness of five in the Mohs Hardness Scale. Specimens with excellent clarity and color are sometimes cut as faceted gemstones. Those with good color and translucence are cut as cabochons. Green, brown, blue, yellow, violet, pink, colorless.

Apatite: Its uses as a mineral and gemstone

geologyAre apatite minerals in demand?Apatite minerals will always be in demand by collectors for those beautiful, transparent, yellow-to-greenish-yellow crystals and, much more importantly, by industrial factions for phosphate rock which, while not visually appealing, is vital to global food production. This story about apatite previously appeared in Rock & Gem magazine.

Apatite: From Crystals to Phosphate Rock | Rock & Gem Magazine

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Apatite: The mineral apatite information and pictures

WEBApatite is the most common phosphate mineral, and is the main source of the phosphorus required by plants. The bones and teeth of most animals, including humans, are …

The designation "Apatite Group" has been used with different definitions in the history of mineralogy. The new nomenclature of the apatite supergroup and its divisons in 5 groups, among them the apatite group was approved by the IMA in 2010 (Pasero et al. 2010). A group in the Apatite Supergroup which includes hexagonal and pseudohexagonal ...

how much apatite mineral would be worthwhile to mine The ore contains a very pure magnetite-apatite mix, containing more than 60 iron and an average of 09 phosphorus Black ore contains less apatite than grey ore The original reserve at Kiruna …

"Apatite" is a field term for unidentified calcium phosphate members of the apatite group. Most "apatite" is fluorapatite, whereas hydroxylapatite is much less common and chlorapatite is very rare. "Apatite" crystals are short to long hexagonal prisms [0001], with {10 1 0} and {10 1 1} dominant; also thick tabular {0001}, frequently in the crystals of …

Here are my three tips to find a Gem and Mineral Club and have a blast dong it. 1. The secret is to just keep going. It gets better. Since the world of rocks and minerals is very vast and varied, there are going …

By Douglas Watts. Pic 1. Pic 2. The quarries and pegmatite complex on the eastern side of Mount Apatite in Auburn, Maine are just about the only places left where the public can visit, view and collect gem Maine tourmaline. This exception is due to the foresight of the people of the City of Auburn, who wisely acquired the land in the 1970s …

The apatite of Palache (1935) is mostly this species. It was reported by Nuttall (1822) and Penfield (1880); the extant data were summarized by Palache (1935). Much blue and green fluorapatite from the orebodies has been mislabeled as svabite, not known with certainty from here. The aquatite of Koening (1889) is a printer's misspelling for apatite.

Apatite is a mineral that is composed of calcium phosphate, with the chemical formula Ca5(PO4)3(OH,F,Cl). It is a …

Apatite. Panasqueira Mines, Covilha, Castelo Branco, Portugal. Thumbnail, 2.7 x 2.0 x 1.8 cm. Ex. Irv Brown. $950.00. Order Now. Although there are thousands of apatites that have come from this mine to the market over time, this one stands out as a fine thumbnail for the obvious reasons you can see in the photos.

Consequently, different minerals have different signature ratios of calcium to strontium. The ratios in the foliage revealed that spruce and fir trees were tapping into apatite—via fungal hyphae—for their calcium, whereas sugar maples, which lack ectomycorrhizal fungi, could only sip it from the soil solution.

Everything you ever wanted to know about apatite. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings. ... the term "apatite" refers to the …

1ct +. $5 - 50/ct. The price of colored gemstones is evaluated almost always on the hue, the tone and the saturation of their color, and apatite is no different. The Apatite gemstones described as neon blue, electric blue …