Feldspar
Orthoclase is a mineral with formula of KAlSi3O8 or K(AlSi3O8). The corresponding IMA (International Mineralogical Association) number is IMA1962 s.p.. The IMA symbol is Or. — RRUFF Project
- IUPAC name
- aluminum;potassium;octakis(oxygen(2-));tris(silicon(4+))
- Molecular formula
- AlKO8Si3
- Molecular weight
- 278.33 g/mol
- Exact mass
- 277.8353415 Da
- Topological polar surface area
- 8.0 Ų
- Hydrogen-bond donors
- 0
- Hydrogen-bond acceptors
- 8
- Covalent units
- 13
- Defined stereocentres
- 0
Also known as
4 more reported names
External database identifiers
- EPA DTXSID:DTXSID901021761
Evidence from additional scientific databases
NIH PubChem PUG-View
Attributed physical-property, hazard, environmental and use annotations.
- Physical Description: Feldspar is the name for the largest group of minerals in igneous rocks; Composed of aluminum silicate plus potassium and sodium; Granite consists of quartz, feldspar, and other minerals in small amounts; [Harber, p. 347] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- Physical Description: White to tan granules or powder; [K-T Feldspar MSDS] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- Signal: Warning Source: European Chemicals Agency (ECHA)
- GHS Hazard Statements: H373 (100%): May causes damage to organs through prolonged or repeated exposure [Warning Specific target organ toxicity, repeated exposure] Source: European Chemicals Agency (ECHA)
- Precautionary Statement Codes: P260, P319, and P501 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
- ECHA C&L Notifications Summary: The GHS information provided by 1 company from 1 notification to the ECHA C&L Inventory. Source: European Chemicals Agency (ECHA)
- Industrial Processes with risk of exposure: Mining [Category: Industry]; Glass Manufacturing [Category: Industry] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- Activities with risk of exposure: Ceramics making [Category: Hobbies]; Glassblowing [Category: Hobbies] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- Sources/Uses: Permitted for use as an inert ingredient in non-food pesticide products; [EPA] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record
Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.
Additional source coverage and match status
| Source | Result | Checked |
|---|---|---|
| NIH PubChem PUG-View | Exact match | 2026-08-31 |
A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.
Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.