apatite, any member of a series of phosphate minerals, the world's major source of phosphorus, found as variously coloured glassy crystals, masses, or nodules. If not for its softness (Mohs hardness 5, compared with the 7 to 9 of most …
Apatite is the name of a group of phosphate minerals that have a familiar chemical composition and share the same physical properties. They are a significant component of phosphorite and used to make chemicals, acids, and fertilizers. Apatite has a consistent hardness and serves as the index mineral for a hardness of 5 in the Mohs Hardness Scale.
Apatite is a versatile phosphate rock crystal known for inspiring motivation, clarity, and self expression. Crystal Stone highlights its ability to boost spiritual growth, foster positivity, and offer everyday benefits—from meditation support to wearable empowerment.
Calcium phosphate uroliths (hydroxyapatite, brushite, whitlockite, and octacalcium phosphate) are uncommon in dogs. ... and dystrophic and ectopic mineralization of vital tissues (blood clots, urothelium, etc.). Diagnostic. Calcium phosphate uroliths include apatite, brushite, and octacalcium phosphate. • Serum calcium. Investigate causes for ...
Apatite is the generic name, which was first introduced by German geologist A.G. Werner. These minerals and their synthetic analogs represent a major class of ionic compounds and the most common crystalline form of calcium phosphates, which are of interest of many industrial branches and scientific disciplines. Since, apatite (fluorapatite) is the most abundant …
The two forms of calcium phosphate include apatite (sometimes reported as carbonate apatite), which is the crystal type found in bone, or calcium hydrogen phosphate (brushite); the frequency of apatite is much greater than brushite. Calcium phosphate crystals in the urine sediment are typically dark and amorphous.
Even though the content of selected individuals was not enough to analyze their XRD characteristics, authigenic apatite individuals have larger diameters (Fig. 3, Fig. 4, Fig. 5) than apatite nanocrystals in collophanites (Fig. 2 h, i), resulting from that phosphate minerals transformed and grew up during diagenesis.
Apatite is the name given to a group of phosphate minerals, usually referring to hydroxylapatite (or hydroxyapatite), fluoroapatite (or fluorapatite), and chloroapatite (or chlorapatite).They are named for the presence of hydroxide (OH-), fluoride (F-), and chloride (Cl-) ions, respectively, in the crystal lattice. These three forms of apatite are not readily distinguishable, as each specimen ...
Growth and structure of lamellar mixed crystals of octacalcium phosphate and apatite in a model system of enamel formation. J Cryst Growth 116:319-326. Google Scholar. lijima M., Tohda H., Suzuki H., Yanagisawa T., Moriwaki Y. (1992b). Effects of F~ on apatite-octacalcium phosphate intergrowth and crystal morphology in a model system of tooth ...
This review considers the fundamentals of calcium phosphate apatite characterization discussing several techniques: electron microscopy/EDX, XRD, FTIR/Raman spectroscopies, chemical …
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, but in …
Crystals make stones and their names signify the kidney stone types. Here are the names of the crystals that make the stones: CAOX, Calcium Oxalate; CAP, Calcium phosphate; UA, Uric Acid; Cystine; Struvite. The …
All in all, the conclusion that an apatite phase has been obtained requires, as in every reliable materials science study, adequate physico-chemical characterization. This contribution is intended to review the main characteristics to be expected from a calcium phosphate apatite compound, drawn from complementary characterization techniques.
most abundant phosphate mineral. Apatite forms the base of the P cycle, which begins when the (PO 4) 3-phosphate group is released as apatite weathers at the Earth's surface. The mineral occurs in igneous, metamorphic, sedimentary, and hydrothermal rock systems, and is …
Beneficiation of low-grade phosphate deposits through direct froth flotation has captured more attention to satisfy the future needs of phosphorous industry. This is owing to the excessive consumption of the global reserves of high-grade phosphate deposits. Phosphate flotation using mixed collectors has been proved to give greater selectivity and high recovery of apatite …
My first stone analysis (2017) showed 50% Calcium oxalate monohydrate, 40% Calcium oxalate dihydrate, and 10% Calcium phosphate (apatite). My second analysis (2021) showed 60% Calcium oxalate …
The phosphate group contains many minerals, but most are extremely rare. Apatite is the only common example. Vanadates and arsenates, which are closely related to the phosphates in chemistry and structure, are …
Fossilized wood where the replacement of the wood is by phosphates, principally apatite. A yellowish green coloured apatite, especially from Marcia, Spain. Synonyms pertaining to …
The sintering of silicon doped calcium phosphate ceramics prepared from a basic colloidal hydroxyapatite (Ca 5 (PO 4) 3 OH or HA) precipitate mixed with silica over 800 °C yields a phase mixture of tricalcium phosphate phases (TCP) designated Si–TCP, β-TCP and a silicon substituted dehydrated apatite (Si–Ap). The Si–TCP phase is defined as a combination of a …
Phosphate minerals are utilized in various fields. The apatite group is well known among the phosphate minerals. Our bones and teeth are also composed of apatites. Moreover, some naturally occurring phosphate minerals include radioactive elements. The crystal...
Phosphorus makes up about 0.10 percent of the weight of Earth's crust in the form of phosphate minerals and phosphoruscontaining organic compounds (eg, Mackey and Paytan 2009; Tiessen 2008).
Apatite-group minerals, the dominant repository of phosphate within Earth's crust, are insoluble under most conditions 5, and the presence of Fe 2+, solubilised under ancient O 2-poor ...
Among these phases, the natural occurrence of calcium orthophosphate is largely represented by apatite, a mineral series composed of three isomorphic endmembers: hydroxylapatite (HAP, Ca 5 (PO 4) 3 OH); chlorapatite (ClAP, Ca 5 (PO 4) 3 Cl); and fluorapatite (FAP, Ca 5 (PO 4) 3 F). In the geological record, apatite is commonly represented by FAP, …
Apatite, a phosphate mineral cherished in the gemstone world, represents one of nature's most versatile and colorful crystal formations. While less known than popular gems like sapphires or emeralds, apatite has gained …
Request PDF | On Jan 1, 2024, Xiaomei Wang and others published Phosphate oxygen isotopes of sedimentary apatite from the Mesoproterozoic successions | Find, read and cite all the research you ...
Biological apatite is an inorganic calcium phosphate salt in apatite form and nano size with a biological derivation. It is also the main inorganic component of biological hard tissues such as bones and teeth of vertebrates. Consequently, biological ...
Apatite is one of nature's most versatile minerals, playing a vital role in everything from agriculture to jewelry and even human biology. Best known as the primary source of phosphorus in fertilizers, apatite also forms beautiful, …
Apatite is the most abundant phosphate mineral which include more than 95% of al phosphorus in the Earth´s crust. The seventh chapter of this book provides brief description of sedimentary and igneous phosphate rocks and introduces basic ideas for characterization and classification of phosphate rocks. The chapter continues with description of biogenic apatites, …
Relationships between geological phosphorite deposition and biological apatite nucleation have often been overlooked. However, similarities in biological apatite and phosphorite mineralogy suggest that their chemical formation mechanisms may be similar. This review serves to draw parallels between two newly described phosphorite mineralization processes, and …
Lead apatite stands out among phosphate minerals due to its unique composition and properties. While apatite minerals share a hexagonal crystal structure, lead apatite's lead ions confer distinctive characteristics, such as increased density and specific optical properties. These differences have practical implications for environmental ...
Apatite is the principal primary mineral, but a number of others are common in deposits formed during weathering of phosphate *In the trade the phosphate content of phosphate rock and fertilizer is commonly re ported as Ca3(PO4 >2, known as bone phosphate of lime (B.P.L.). To convert PjOs to
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 …
Apatite refers to a group of phosphate minerals that have similar chemical compositions and physical properties. These minerals are a key component of phosphorite, a type of rock mined for its phosphorus, which is essential for making fertilizers, phosphoric acid, and other industrial chemicals.. In geology, apatite is most recognized as the mineral used to mark …
Substances non métalliquesApatiteEn brefÀ quoi ressemble le l'apatite?L'apatite est un minéral de phosphate (ion PO43-) de forme allongée; elle peut être verte, bleue, mauve, jaune, rose ou incolore.Pourquoi est-ce important?L'apatite fait …
Calcium phosphate apatite retention in the arterial wall necessitates precipitation on an anionic platform. Here, we explore the role of tissue-free DNA as such a platform. Methods: The first step consisted of histological observation of samples from human and rat calcified arteries. Various stains were used to evaluate colocalization of free ...
Studies of apatite mineral formation are complicated by the possibility of forming several calcium phosphate phases. The least soluble, hydroxyapatite (HAP), is preferentially formed under neutral or basic conditions. In more acidic solutions phases such …