多孔的鈣質石灰岩，由碳酸鈣沉澱於泉口或間歇泉口形成，或者沿著溪流或於湖泊底部或沿岸沉積而成。軟質石灰華與石灰華的不同之處在於前者通常質地較軟也較易壓碎。

軟質石灰華(P,,U,繁體中文-偏好,D,,)
石灰華(質地較軟)　(,U,繁體中文-非偏好,UF,U,U)
灰華(,U,繁體中文-非偏好,UF,U,U)
多孔凝灰岩(,U,繁體中文-非偏好,UF,U,U)
石灰質(,U,繁體中文-非偏好,UF,U,U)
juan chih shih hui hua (P,,U,韋氏拼音-偏好,UF,U,U)
ruǎn zhí shí huī huá (P,,U,漢語拼音-偏好,UF,U,U)
ruan zhi shi hui hua (P,,U,漢語拼音(無聲調)-偏好,UF,U,U)
tufa(P,,U,英文-偏好,D,U,N)
tufa(P,,U,西班牙語-偏好,D,U,U)
calcareous tufa(,U,英文-非偏好,UF,U,N)
calc-tufa(,U,英文-非偏好,UF,U,N)
tufa, calcareous(,U,英文-非偏好,UF,U,N)
sedimentgesteente(P,,U,荷蘭語-偏好,D,U,U)

藝術與建築詞典根目錄
....材料層面
........材料 (材料層面)
............材料
................<依成分區分之材料>
....................無機材料
........................岩石
............................沈積岩
................................<依成分區分之沉積岩>
....................................碳酸鹽岩
........................................石灰岩
............................................<依成分區分之石灰岩>
................................................<依成分區分之石灰岩：聚集體種類>
....................................................泉華 (聚集體種類)
........................................................軟質石灰華

distinguished from....

石灰華(質地較硬)

英文....	Calcareous, porous limestone formed by the precipitation of calcium carbonate at the vents of springs and geysers, along streams, or on the bottoms or shores of lakes. It is distinguished from travertine by generally being soft and easily crumbled.
荷蘭語....	Vaak kalkhoudend, poreus gesteente gevormd als neerslag van bronnen of stromen.
西班牙語....	Caliza calcárea porosa formada por la precipitación de carbonato de calcio en las salidas de vertientes y geysers, a lo largo de corrientes de agua o en el fondo u orillas de lagos. Se distingue del travertino por ser en general blanda y fácil de deshacer.

軟質石灰華............	[AS-Academia Sinica]
.................	國家教育研究院－雙語詞彙、學術名詞暨辭書資訊網 August 28, 2012
石灰華(質地較軟)............	[AS-Academia Sinica]
.................	藝術名詞與技法辭典 466
.................	國家教育研究院－雙語詞彙、學術名詞暨辭書資訊網 August 28, 2012
灰華............	[AS-Academia Sinica]
.................	國家教育研究院－雙語詞彙、學術名詞暨辭書資訊網 August 28, 2012
.................	智慧藏百科全書網 August 28, 2012
.................	大英百科全書線上繁體中文版 August 28, 2012
多孔凝灰岩............	[AS-Academia Sinica]
.................	大英視覺藝術百科全書 Vol. 9,pp. 193
石灰質............	[AS-Academia Sinica]
.................	藝術名詞與技法辭典 466
tufa............	[VP]
.................	Dictionary of Geological Terms (1984) 539, sedementary; not to be confused with volcanic rock tuff
.................	Encyclopaedia Britannica (1991) Vol. 10, 840, in entry "sinter"
.................	National Museum of American Art, Media Thesaurus (1980s)
.................	Andrews, Living Materials (1983) 73
.................	Brady and Clauser, Materials Handbook (1977) 887
.................	McGraw-Hill Dictionary of Scientific and Technical Terms (1989) 1977
.................	Webster's Third New International Dictionary (1961)
.................	BHA Subject Headings (1985-)
.................	Diccionario de términos científicos y técnicos (1981) 5:2801
calcareous tufa............	[VP]
.................	Encyclopaedia Britannica (1991) Vol. 10, 840
calc-tufa............	[VP]
.................	Encyclopaedia Britannica (1991) Vol. 10, 840
sedimentgesteente............	[Bureau AAT]
.................	AAT-Ned (1994-)
Subject:............	[Bureau AAT]
.................	Encyclopaedia Britannica (1991) Vol. 10, 840, too broad as UF; includes travertine too; calcareous sinter
.................	Candidate term Candidate term -- BHA -- 3/97; this seems to be what they mean; RObert French dictionary translates it as "tuf-calcaire;" tuffeau
.................	Van Dale Engels-Nederlands (1989)

Getty AAT: 300011712 Getty AAT: http://www.getty.edu/vow/AATFullDisplay?find=costume&logic=AND¬e=&subjectid=300011712
聯合目錄： 軟質石灰華 、石灰華 、灰華 、多孔凝灰岩 、石灰質 、juan chih shih hui hua 、ruǎn zhí shí huī huá 、ruan zhi shi hui hua 、tufa 、calcareous tufa 、calc-tufa 、tufa, calcareous 、sedimentgesteente 、tufa