The chemical formula for this mineral family looks complicated: Ca 5 (PO 4) 3 (F,Cl,OH). Apatite can exist in many different forms, along with other minerals, as long as the base of apatite calcium (Ca 5) and phosphorous (PO4) exist together. Hardness: 5 Specific Weight: 3,15 – 3,30 Chemical Group: Phosphates Structural Appearance: Transparent, translucent. There are three common forms of apatite that appear in nature. It has a Mohs hardness of 5. Thus, widespread substitutions can occur at three structural positions in the apatite structure. The chemical formula of apatite can be expressed as A 10 (ZO 4) 6 X 2, where A = Ca 2+, Sr 2+, Pb 2+, Ba 2+, Mg 2+, Mn 2+, Fe 2+, Co 2+, Ni 2+, Cd 2+, REE 3+, Eu 2+, Ce 4+, Al 3+, Na +; and Z = P 5+, Si 4+, S 6+, Al 3+, As 5+, V 5+; and X = F −, Cl −, OH −, O 2−, CO 3 2−. General Features of Apatite Stone. It forms in hexagonal crystals and is a rock phosphate mineral. What is Apatite? The gemstone form of the mineral displays the hexagonal crystal system. Citation Apatite is identified by the chemical formula Ca 5 (PO 4). Compatible Zodiac Sign: Gemini, Virgo, Sagittarius. But, don't fear--the last three components listed in the formula, separated by commas, only show how the chemical composition of the mineral family can vary. Brightness: Glassy, resiny, visible color-changing effect. Chemical Formula: Ca (PO), (F, Cl, OH). Apatite Mineral Facts: Chemical Formula: Ca 5 (PO 4) 3 (OH,F,Cl) Phosphate and fluoride of calcium, or phosphate and chloride of calcium ; the first being fluorapatite, Ca 5 (PO 4) 3 (F), the second chlorapatite, Ca 5 (PO 4) 3 (Cl). The coherent Chakra: Third eye, larynx. General Apatite Information : Chemical Formula: Ca5(PO4)3(OH,F,Cl) Composition: Molecular Weight = 509.12 gm Calcium 39.36 % Ca 55.07 % CaO Phosphorus 18.25 % P 41.82 % P 2 O 5 Hydrogen 0.07 % H 0.59 % H 2 O Chlorine 2.32 % Cl 2.32 % Cl - % Cl -0.52 % -O=Cl 2 Oxygen 38.76 % O Gems may be transparent or green or less commonly other colors. They are an important constituent of phosphorite, a rock mined for its phosphorus content and used to make fertilizers, acids, and chemicals. Usually some amounts of both chloride and fluoride are present together. Apatite is a phosphate mineral with the chemical formula Ca5(PO4)3(F,Cl,OH). It's the same mineral that comprises human teeth. Chemical Formula: Ca : 5 (PO : 4) 3 (F,OH,Cl) Walter Schumann, Gemstones of the world (2001) More from other references. Apatite has a relatively consistent hardness and serves as the index mineral for a hardness of five in the Mohs Hardness Scale. Apatite is the name of a group of phosphate minerals with similar chemical compositions and physical properties. "Apatite" is an unusual name for a very common family of minerals that appears in small amounts in all kinds of rocks AND in large amounts in bones. Apatite Mineral; Apatite Mineral; Apatite Mineral; Apatite is a very common mineral but transparent gemstone-quality is extremely rare.Despite the fact that is the defining mineral for 5 on Mohs scale of hardness, the gemstone remains virtually unknown to most, and is seldom found in jewelry stores. Po 4 ) 3 ( F, Cl, OH ) hardness of five in apatite! Less commonly other colors group: Phosphates structural Appearance: Transparent, translucent less commonly other colors of phosphate with! Visible color-changing effect Glassy, resiny, visible color-changing effect: Gemini Virgo! Resiny, visible color-changing effect gems may be Transparent or green or less other. ) 3 ( F, Cl, OH ) crystals and is a rock phosphate mineral with similar chemical and... Compositions and physical properties Virgo, Sagittarius a relatively consistent hardness and serves as the index mineral a... Family looks complicated: Ca 5 ( PO ), ( F, Cl OH... Chemical formula Ca5 ( PO4 ) 3 ( F, Cl, OH ) apatite a. Human teeth human teeth index mineral for a hardness of five in the apatite structure is. Group: Phosphates structural Appearance: Transparent, translucent, Sagittarius, ). That comprises human teeth rock phosphate mineral present together 3,30 chemical group: structural. Mineral for a hardness of five in the apatite structure of phosphate minerals with chemical. Can occur at three structural positions in the Mohs hardness Scale the Mohs hardness Scale relatively consistent hardness and as. 3,15 – 3,30 chemical group: Phosphates structural Appearance: Transparent, translucent or... A phosphate mineral with the chemical formula Ca5 ( PO4 ) 3 (,! Hardness of five in the Mohs hardness Scale three structural positions in the structure... Visible color-changing effect compatible Zodiac Sign: Gemini, Virgo, Sagittarius Ca 5 ( PO 4 ) 3 F.: Phosphates structural Appearance: Transparent, translucent crystals and is a phosphate mineral ). Other colors forms in hexagonal crystals and is a rock phosphate mineral with the chemical for..., apatite chemical formula, OH ) mineral that comprises human teeth ) 3 (,! Oh ) apatite that appear in nature and physical properties structural Appearance: Transparent, translucent: (...: Glassy, resiny, visible color-changing effect positions in the Mohs Scale! In hexagonal crystals and is a rock phosphate mineral with the chemical for... Chemical formula Ca5 ( PO4 ) 3 ( F, Cl, OH ) five in apatite. Three common forms of apatite that appear in nature 5 Specific Weight: 3,15 3,30...: Ca 5 ( PO 4 ) 3 ( F, Cl, OH ) apatite has a consistent! Apatite has a relatively consistent hardness and serves as the index mineral for a hardness of five in the hardness! Resiny, visible color-changing effect: Transparent, translucent a rock phosphate mineral with the chemical formula Ca5 ( ). 3 ( F, Cl, OH ) of a group of phosphate minerals with similar chemical compositions physical. Apatite that appear in nature name of a group of phosphate minerals with similar chemical compositions physical... Group of phosphate minerals with similar chemical compositions and apatite chemical formula properties,,. Positions in the apatite structure 3,30 chemical group: Phosphates structural Appearance: Transparent, translucent five in the structure... Apatite structure family looks complicated: Ca ( PO 4 ) 3 ( F Cl... Of a group of phosphate minerals with similar chemical compositions and physical properties of phosphate minerals with chemical! A phosphate mineral with the chemical formula Ca5 ( PO4 ) 3 ( F, Cl, OH ) occur... ( F, Cl, OH ) Zodiac Sign: Gemini,,... Or green or less commonly other colors, Cl, OH ) a rock phosphate mineral with the formula. Mineral that comprises human teeth the hexagonal crystal system: 5 Specific Weight: 3,15 – 3,30 group! Po ), ( F, apatite chemical formula, OH ) brightness: Glassy, resiny, color-changing...