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Fluorapatite - an overview | ScienceDirect Topics

Fluorapatite is a highly insoluble calcium phosphate phase. The solubility product of stoichiometric fluorapatite at 37°C is 3.19 ± 0.14×10 −61 mol l −1 (for Ca 5 (PO 4) 3 F as reported by Moreno et al. [53]) and appears significantly lower than that of HA in the same conditions (7.36 ± 0.93×10 –60 mol l −1 for Ca 5 (PO 4) 3 OH). A ...

rock phosphate specs - Magazene

Keeping in mind the diverse requirements of the clients, we offer a wide range of Rock Phosphate Chemical Name: Calcium (Fluoro, Chloro, Hydroxy) Phosphate Chemical Formula: Ca5(PO4)3(OH, F, Cl) Specifications: SiO2 885%; P2O5 3130%. Get Info; Rock Phosphate - View Specifications & Details of Rock,

Fluoride - A Thorough Explanation - Token Rock

Fluoride is the reduced form of fluorine. Fluorine is the most highly-reactive and chemically unstable of ALL existing chemical elements. Fluorine is not found by itself in nature, because it is so unstable that it chemically combines--violently, in many cases--with practically any other element except, chlorine, nitrogen, oxygen, and the inert gases (helium, neon, argon, krypton, xenon, and ...

Apatite, Ca5(PO4)3(OH,F,Cl), Calcium (Fluoro ... - Alamy

Download this stock image: Apatite, Ca5(PO4)3(OH,F,Cl), Calcium (Fluoro, Chloro, Hydroxyl) Phosphate, a source of phosphorous to be used in fertilizer - DDP6GA from Alamy's library of millions of high resolution stock photos, illustrations and vectors.

Open Access Minerals that Host Metals at Dorowa Rock ...

calcium carbonate plug forms a very small portion of the complex and the foyaites and ijolites have been extensively in er alz dw t hpog,v mcu .T main rock being mined at Dorowa is fluoro-apatite (Ca 5 (PO 4) 3(OH, F, Cl) rock which comprises more than 50% of the apatite. Carbonate and hydroxyl apatite …

575ct Blue Apatite Crystal Mineral Palm Stone - Madagascar

Blue Apatite Cabochon Pebble Polished Natural Crystal Mineral Palm Stone from Madagascar . You will receive exactly this Blue Apatite Cabochon Pebble - 53 x 47 x 28 mm / 2 1/8 x 1 7/8 x 1 1/8 Inches; 575ct / 115g / 4oz (see photo, the photos are taken under bright light, stand not included)!

Apatite Gemstone Information

Apatite belongs to the group of phosphate minerals that add up to hydroxyl-apatite, fluor-apatite and chlor-apatite. It gets its name from the Greek word 'apatao' meaning 'to deceive' or ' even misleading', because Apatite stone is confused with other crystals, especially Fluorite and Aquamarine.

Pollution implications of Save River water from weathering ...

The rocks have been extensively mineralized with phlogopite, vermiculite and apatite. The main rock being mined at Dorowa is fluoro-apatite Ca 5 (PO 4) 3 (OH, F, Cl) which comprises more than 50% of the apatite. Carbonate and hydroxyl apatite rocks are also present (Fernandes, 1978). Mining is concentrated in two main centres within a syenite ...

FLUORO-EDENITE

matic fluoro-edenite are quite similar according to optical, chemical, and Rietveld analyses (Burragato et al., 2005). (b) Physical properties Different morphologies that have been found for fluoro-edenite are shown in Fig. 1.2. Biancavilla fluoro-edenite is transparent, deep yellow with prismatic to …

phosphorus in apatite

Apatite uses span across diverse fields and uses of apatite determine the different forms of it that we know as a mineral as a gemstone or as apatite crystals Uses of Apatite as Mineral As a mineral apatite is chiefly used as a phosphorus source for the manufacture of fertilizers. APATITE Calcium Fluoro Chloro Hydroxyl Phosphate

: 13.5ct Blue Green Apatite Rough Set Natural ...

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Fluorapatite - Wikipedia

Fluorapatite, often with the alternate spelling of fluoroapatite, is a phosphate mineral with the formula Ca 5 (PO 4) 3 F (calcium fluorophosphate). Fluorapatite is a hard crystalline solid. Although samples can have various color (green, brown, blue, yellow, violet, or colorless), the pure mineral is colorless as expected for a material lacking transition metals.

Rock Phosphate Specifications

Phosphate rock comes from geologic deposits located around the world. Its main constituent is apatite, a calcium phosphate mineral primarily extracted from sedimentary marine deposits, with a small amount obtained from igneous sources. Most phosphate rock is recovered through surface mining, although some is extracted from underground mines.

Apatite - Geology In

Fluoro-chloro apatite forms the basis of the now obsolete Halophosphor fluorescent tube phosphor system. Dopant elements of manganese and antimony, at less than one mole-percent, in place of the calcium and phosphorus impart the fluorescence, and adjustment of the fluorine to chlorine ratio adjusts the shade of white produced.

Recovery of rare earth elements from nitrophosphoric acid ...

The process starts with digestion of the phosphate rock in concentrated nitric acid. The overall reaction, which takes place at a temperature of about 70 °C is given in reaction (1).The kinetics of this reaction has been studied extensively by Olanipekun (2001). (1) Ca 5 PO 4 3 F s + 10 HNO 3 aq → 5 Ca NO 3 2 aq + 3 H 3 PO 4 aq + HF g Calcium is a non-nutrient in NPK fertilizer and seen as ...

Apatite - Wikipedia

Apatite is a group of phosphate minerals, usually referring to hydroxyapatite, fluorapatite and chlorapatite, with high concentrations of OH −, F − and Cl − ions, respectively, in the crystal.The formula of the admixture of the three most common endmembers is written as Ca 10 (PO 4) 6 (OH,F,Cl) 2, and the crystal unit cell formulae of the individual minerals are written as Ca 10 (PO 4) 6 ...

APATITE (Calcium (Fluoro-, Chloro-, Hydroxyl-) Phosphate)

Apatite is actually three different minerals depending on the predominance of either fluorine, chlorine or the hydroxyl group. These ions can freely substitute in the crystal lattice and all three are usually present in every specimen although some specimens have been close to in one or the other.

Apatite - Science Olympiad

There is also a rare member of Apatite which has the phosphateradical (PO 4) partially replaced by a carbonate radical (CO 3). It is known as Carbonate-Apatite (or Carbonate-rich Apatite), and it has a chemical formula of Ca 5 (PO 4,CO 3) 3 (OH,F). Composition: Apatite group - Calcium fluoro-chloro-hydroxyl phosphate Individual Group Members:

Apatite - 1 answer | Crossword Clues

• A glassy, variously colored calcium phosphate mineral • Native phosphate of lime, occurring usually in six-sided prisms • A mineral so called because it is often mistaken for other minerals • Common calcium phosphate mineral, Ca5(PO4)3(F,OH,Cl) • Apatite is a widely distributed accessory constituent in all classes of rock

APATITE AND ROCK PHOSPHATE Indian Minerals Yearbook …

apatite. Fluor-apatite Ca 5 (PO 4) 3 F is the most common variety of apatite and also a secondary source of fluorine. Collophane is apparently a cryptocrystalline or amorphous calcium phosphate complex. Rock phosphates or phosphorites are sedimentary phosphatic deposits comprising fine-grained mixture of various calcium phosphates,

Apatite: The mineral apatite information and pictures

Apatite 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 composed of calcium phosphate, which is the same material as Apatite. (These biological Apatites are almost exclusively the Hydroxylapatite type.)

beneficiation of phosphate rock process

Phosphate Beneficiation Process - Mineral Processing Phosphate Beneficiation Market Specifications Bone phosphate of lime, 70 to 72 per cent, common. Bone

Apatite Stone - Meaning & Healing Properties - Mineral ...

Green Apatite balances the Heart Chakra to better give and receive love energy. Yellow Apatite opens the Solar Plexus Chakra to eliminate lethargy, poor digestion and toxins. Metaphysical Uses for Apatite. Because Apatite is a phosphorous mineral found naturally in our physical bodies, it can help energetically strengthen our energy bodies.

APATITE CRYSTAL MATRIX - RocknCrystals

APATITE CRYSTAL MATRIX. Cute little APATITE CRYSTAL MATRIX for your collection. Glossy looking crystals on orange calcite matrix. Location: Lake Baikal, Russia. Dimensions: 6.3cm x 5cm x 5.6cm, 208g. Crystal measures cm across flats. Apatite: Ca5(PO4)3(OH,F,Cl), Calcium (Fluoro, Chloro, Hydroxyl) Phosphate.